MathCounts: prepare for USA middle school competition (Anki)

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Anki is a flashcard tool which incorporates sophisticated research to maximize your study efficiency. You can import public “decks” of flashcards, such as this one. Cards are customizable! When this deck is imported into the desktop program, cards will appear as if you made them yourself. About this Flashcard Deck… I’m a MathCounts coach in […]

Probability and combinatorics (Khan Academy)

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Permutations and combinations. Using combinatorics to solve questions in probability. (1) Permutations Factorial and counting seat arrangements Permutation formula Possible three letter words Zero factorial or 0! Ways to arrange colors Ways to pick officers Permutations (2) Combinations Intro to combinations Combination formula Handshaking combinations Combination example: 9 card hands Combinations Permutations & combinations (3) […]

Functions (Khan Academy)

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Functions are mathematical entities that assign unique outputs to given inputs. Sounds simple? Think again! In this topic you will evaluate, graph, analyze, and create various types of functions. (1) Introduction to functions What is a function? (2) Evaluating functions Evaluating a function: formula Evaluate functions Evaluate a function: graph Evaluate functions from their graph […]

Decimals (Khan Academy)

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Understanding decimals conceptually, using operations with decimals, rounding and estimating with decimals, and converting decimals. (1) Conceptualizing decimals and place notation Decimal place value Decimals in written form 1 Decimals in written form 2 Decimals in expanded form 1 Decimals in expanded form 2 Decimals in expanded form Comparing decimal place values Compare decimal place […]

Negative numbers and absolute value (Khan Academy)

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Extending our understanding of numbers below 0. Thinking about “absolute” distance from 0. (1) Negative number basics Intro to negative numbers Negative numbers on the number line Missing numbers on the number line examples Missing numbers on the number line Ordering negative numbers Ordering negative numbers Number opposites (2) Adding and subtracting negative numbers Number […]

Statistics and probability (Khan Academy)

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This introduction to probability and statistics explores probability models, sample spaces, compound events, random samples, and a whole lot more. (1) Basic probability Intro to theoretical probability Simple probability: yellow marble Simple probability: non-blue marble Simple probability Experimental probability Experimental probability Intuitive sense of probabilities Comparing probabilities (2) Probability models Theoretical and experimental probabilites Making […]

Fractions, decimals, & percentages (Khan Academy)

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In these tutorials, we’ll explore the number system. We’ll convert fractions to decimals, operate on numbers in different forms, meet complex fractions, and identify types of numbers. We’ll also solve interesting word problems involving percentages (discounts, taxes, and tip calculations). (1) Converting fractions to decimals Decimal to simplified fraction Rewrite decimals as fractions Rewriting decimals […]

Measurement and data (Khan Academy)

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Learn how to measure length, tell time, count money, and make graphs. (1) Length and size Compare size Ordering by length Order by length Indirect measurement (2) Measuring length Measure lengths 1 Measuring lengths 2 Measure lengths 2 Measuring lengths with different units Measuring lengths with different units (3) Comparing and estimating length Comparing lengths […]

Addition and subtraction within 100 (Khan Academy)

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Learn to add and subtract two-digit numbers within 100. (1) Adding 1s and 10s Adding 1 vs. adding 10 Add 1 or 10 Understanding place value when adding tens Understanding place value when adding ones Adding 1s and 10s guided practice Add 1s or 10s (no regrouping) (2) Subtracting 1s and 10s Subtracting 1 vs. […]

Counting (Khan Academy)

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Learn how to count. Say how many objects you see. (1) Counting small numbers Counting with small numbers Count with small numbers Counting in order Count in order Find 1 more or 1 less than a number (2) Numbers 0 to 120 Missing numbers Number grid Missing numbers between 0 and 120 Numbers to 100 […]

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