Topics

Numbers and Arithmetic 1

• First Numbers·Ages 3–5How do you teach one more and one less to a preschooler?Teach one more and one less with real objects and tiny stories. Count a small group together, then add one toy and ask how many there are now, or take one away and ask…Read the topic

Geometry and Measurement 33

• Euclidean Geometry: Triangles and Circles·Ages 15–16How do you prove two triangles are congruent?To prove two triangles are congruent, show that three specific corresponding pairs of sides and angles are equal using an established congruence theorem: Side-Angle-Side…Read the topic
• Euclidean Geometry: Triangles and Circles·Ages 15–16How do you find the ratio of areas of similar triangles?The ratio of the areas of two similar triangles equals the square of the ratio of their corresponding sides. If the side length ratio, or scale factor, of triangle A to…Read the topic
• Euclidean Geometry: Triangles and Circles·Ages 15–16What is the relationship between central and inscribed angles?When a central angle and an inscribed angle intercept the same arc of a circle, the measure of the central angle is twice the measure of the inscribed angle. Conversely,…Read the topic
• Euclidean Geometry: Triangles and Circles·Ages 15–16Why are tangents from an outside point equal?Tangents drawn to a circle from the same outside point are equal in length because they form two congruent right triangles. When you connect that external point to the…Read the topic
• Euclidean Geometry: Triangles and Circles·Ages 15–16Why do opposite angles of a cyclic quadrilateral add up to 180 degrees?The opposite angles of a cyclic quadrilateral add up to 180 degrees because each opposite angle intercepts one of two arcs that together make a full 360-degree circle. By…Read the topic
• Trigonometry in the Right Triangle·Ages 15–16Why does the ratio between sides depend only on the angle?The ratio between sides in a right triangle depends entirely on the acute angle because fixing that angle locks all three angles to add up to 180 degrees. By Angle-Angle…Read the topic

Algebra and Bagrut Mathematics 38

• Exponents and Logarithms·Ages 16–17How do fractional exponents work?A fractional exponent works by representing both a power and a root at the same time. In an expression like x^(m/n), the denominator n indicates which root to take, and…Read the topic
• Exponents and Logarithms·Ages 16–17How to solve exponential equations with the same base?When an exponential equation shares the same base on both sides, set the exponents equal to each other using the one-to-one property and solve for the variable. If terms…Read the topic
• Exponents and Logarithms·Ages 16–17How do you write an exponential growth and decay function?To write an exponential growth and decay function, use the formula y = a(b)^x, where a is the starting amount, b is the base or factor, and x is the number of time…Read the topic
• Exponents and Logarithms·Ages 16–17How do you evaluate logarithms?Evaluating a logarithm means finding the exponent that turns the base into the number inside. For log base 2 of 32, find the power that turns 2 into 32. Because 2 to the…Read the topic
• Exponents and Logarithms·Ages 16–17What are the laws of logarithms?The laws of logarithms are algebraic rules used to simplify expressions. The product rule states that log_b(xy) = log_b(x) + log_b(y). The quotient rule states that…Read the topic
• Exponents and Logarithms·Ages 16–17How to solve exponential equations with logarithms?You can solve an exponential equation by isolating the exponential term, taking the common or natural logarithm of both sides, and applying the power property to bring…Read the topic

Probability and Statistics 14

• Introduction to Probability·Ages 15–16What is a sample space in probability?A sample space is the complete set of all possible outcomes of a random experiment, where each outcome appears exactly once. An event is any subset of that sample space,…Read the topic
• Introduction to Probability·Ages 15–16How do you find a probability when every outcome is equally likely?When every outcome in a sample space is equally likely, find the probability of an event by dividing the number of favorable outcomes by the total number of possible…Read the topic
• Introduction to Probability·Ages 15–16What is the addition rule in probability?The addition rule states that the probability of event A or event B occurring equals the sum of their individual probabilities minus the probability that both occur…Read the topic
• Introduction to Probability·Ages 15–16How do you use a tree diagram for a two stage experiment?To use a tree diagram for a two stage experiment, draw branches from a starting point for each outcome of the first stage, then draw new branches from each tip for the…Read the topic
• Introduction to Probability·Ages 15–16How do you calculate conditional probability?To calculate a conditional probability, divide the probability of both events happening together (the intersection) by the probability of the given condition: P(A|B) =…Read the topic
• Introduction to Probability·Ages 15–16When are two events independent?Two events are independent when the occurrence of one does not change the probability of the other. Mathematically, event A and event B are independent if and only if P(A…Read the topic

Calculus and Rates of Change 15

• Introduction to Derivatives·Ages 17–18What is an average rate of change?The average rate of change measures how much a function changes per unit of input over a given interval. Mathematically, it is the difference in function values divided…Read the topic
• Introduction to Derivatives·Ages 17–18What is the derivative of a function at a point?The derivative of a function at a point is the instantaneous rate of change of the function at that exact input. Geometrically, it is the slope of the tangent line to the…Read the topic
• Introduction to Derivatives·Ages 17–18How do you differentiate a polynomial?Differentiating a polynomial involves applying the power rule to each term individually. Multiply each coefficient by its variable's current exponent, reduce that…Read the topic
• Introduction to Derivatives·Ages 17–18When do you use the product, quotient and chain rules?You use the product rule when two variable expressions are multiplied together, the quotient rule when one variable expression is divided by another, and the chain rule…Read the topic
• Introduction to Derivatives·Ages 17–18How do you find the equation of a tangent to a graph?To find the equation of a tangent to a graph, find the y-coordinate by plugging the x-value into the original function, find the slope by plugging the x-value into the…Read the topic
• Introduction to Derivatives·Ages 17–18How do you find intervals of increase and decrease and points of extremum?To find intervals of increase and decrease and points of extremum, calculate the first derivative f'(x), set it equal to zero, and solve for candidate values. Test the…Read the topic

World History 27

• The Classical World: Greece and Rome·Ages 15–16How did a Greek polis govern itself?A Greek polis governed itself through direct civic institutions rather than a monarch or distant bureaucracy. During the 5th and 4th centuries BCE, adult male citizens…Read the topic
• The Classical World: Greece and Rome·Ages 15–16How did Athens and Sparta differ?Athens and Sparta differed fundamentally in their government, economy, and social values. In the 5th century BCE, Athens built a direct democracy, open trade, and a…Read the topic
• The Classical World: Greece and Rome·Ages 15–16What caused the Peloponnesian War?The Peloponnesian War (431–404 BCE) was caused primarily by the rapid growth of Athenian imperial power and the fear that expansion provoked in Sparta. After the Persian…Read the topic
• The Classical World: Greece and Rome·Ages 15–16How was the Roman Republic governed?The Roman Republic was governed through a mixed constitution established around 509 BCE. Two elected consuls held executive and military command for one-year terms, the…Read the topic
• The Classical World: Greece and Rome·Ages 15–16Why did the Roman Republic fall?The Roman Republic fell because rapid expansion created deep economic inequalities, political violence replaced compromise, and military reforms tied soldier loyalties to…Read the topic
• The Classical World: Greece and Rome·Ages 15–16How did Rome unite its empire?Rome united its empire by combining military infrastructure, uniform law, and expanding citizenship. Beginning under Augustus around 27 BCE, paved highways and aqueducts…Read the topic

Jewish History 22

• Yahadut: The Chain of Transmission and the World of the Yeshivot·Ages 15–16What is the chain of transmission in Pirkei Avot?In Pirkei Avot 1:1, the chain of transmission begins at Mount Sinai around 1312 BCE according to rabbinic tradition. Moses received the Torah from God, transmitted it to…Read the topic
• Yahadut: The Chain of Transmission and the World of the Yeshivot·Ages 15–16What are the eras from the Tannaim to the Geonim?The chain of Rabbinic transmission spans four successive eras between approximately 10 CE and 1038 CE: the Tannaim (c. 10–220 CE, redacting the Mishnah), the Amoraim (c.…Read the topic
• Yahadut: The Chain of Transmission and the World of the Yeshivot·Ages 15–16What was the difference between Ashkenaz and Sefarad Rishonim?The Rishonim were medieval rabbinic authorities active between approximately 1000 and 1500 CE. In Ashkenaz (northern France and Germany), scholars focused primarily on…Read the topic
• Yahadut: The Chain of Transmission and the World of the Yeshivot·Ages 15–16Why was the Shulchan Aruch accepted?The Shulchan Aruch was widely accepted because it harmonized Sephardic and Ashkenazic traditions into a shared, practical guide. Rabbi Yosef Karo published the…Read the topic
• Yahadut: The Chain of Transmission and the World of the Yeshivot·Ages 15–16Why was the Volozhin yeshiva important?The Volozhin yeshiva was important because it transformed traditional Jewish education. Founded in 1803 by Rabbi Chaim of Volozhin, it served as the mother of all modern…Read the topic
• Yahadut: The Chain of Transmission and the World of the Yeshivot·Ages 15–16Why did the misnagdim oppose Chassidut?The Misnagdim opposed Chassidut primarily out of three deep fears in late-eighteenth-century Eastern Europe. Traditional authorities worried that Chassidic mysticism…Read the topic

The Middle East and the Islamic World 16

• The Arab and Islamic World·Ages 16–17Why was Mecca important before Islam?Before the rise of Islam in the early seventh century, Mecca served as western Arabia's primary commercial crossroads and religious sanctuary. Controlled by the Quraysh…Read the topic
• The Arab and Islamic World·Ages 16–17Why was the hijra important?The hijra was important because this September 622 CE migration transformed Islam from a persecuted religious minority in Mecca into an autonomous political community in…Read the topic
• The Arab and Islamic World·Ages 16–17Why did Islamic conquests spread so quickly?Islamic rule spread so quickly because the Byzantine and Sasanian empires were mutually exhausted after protracted warfare, while Arab forces relied on highly mobile…Read the topic
• The Arab and Islamic World·Ages 16–17What is the difference between Sunni and Shia?Sunni and Shia Muslims split over who should lead the Muslim community after the Prophet Muhammad died in June 632 CE. Sunnis believed leadership should pass by consensus…Read the topic
• The Arab and Islamic World·Ages 16–17What was the Islamic Golden Age?The Islamic Golden Age, roughly from 750 to 1258 CE, was an era of major scientific, philosophical, and cultural advancement centered in cities like Baghdad, Cairo, and…Read the topic
• The Arab and Islamic World·Ages 16–17What are the four sources of Islamic law?In Sunni Islamic jurisprudence, scholars derive rulings from four primary sources: the Quran (the divine revelation), the Sunnah (the Prophet Muhammad's practiced…Read the topic

Historiography and Research Methods 7

• History: Sources and Historiography·Ages 16–17What are the four types of historical evidence?The four main types of historical evidence are documentary texts, material artifacts, oral testimony, and visual or quantitative records. Historians use texts to trace…Read the topic
• History: Sources and Historiography·Ages 16–17Can a source be both primary and secondary?Yes, a single source can function as both primary and secondary depending on your research question. Its status is never fixed on its own. For instance, a history…Read the topic
• History: Sources and Historiography·Ages 16–17How do you analyze bias in historical sources?You analyze a perspective by identifying the creator, their intended audience, and their underlying purpose. Instead of dismissing one-sided historical sources as false,…Read the topic
• History: Sources and Historiography·Ages 16–17How do historians study people who left no written records?Historians study people who left behind no written records by examining material culture, landscape archaeology, oral testimony, and administrative archives. By reading…Read the topic
• History: Sources and Historiography·Ages 16–17Why do history textbooks disagree on the same event?History textbooks often disagree about the same historical event because authors consult different national archives, select different starting dates, emphasize distinct…Read the topic
• History: Sources and Historiography·Ages 16–17What is the difference between history and memory?History is a disciplined, critical inquiry that tests evidence to reconstruct the past, acknowledging gaps and contradictions. Memory is how living groups choose to…Read the topic

Life Skills and Social Involvement 1

• Feelings, Friends and Staying Safe·Ages 3–5How do you teach street and home safety to preschoolers?Teach preschoolers a few short safety rules and practice them calmly every day. On the street: stop at the curb and cross only holding a grown-up's hand. At home:…Read the topic

Road Safety and Online Safety 1

• Road Safety: First Journeys·Ages 6–7Which side of the car should a child get out on?A child should get out on the sidewalk side: the door next to the curb, away from passing cars and bikes. In Israel and the US that is usually the right-hand door, but…Read the topic

• First marks: line, shape and colour·Ages 7–8How do you print a pattern with a potato and a sponge?Make a stamp, paint it, press it, and repeat. A grown-up cuts a potato in half and cuts away around a simple shape, or you cut a shape from a kitchen sponge. Brush on a…Read the topic