Decimals (Khan Academy)

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Learn what decimal numbers are, and see how decimals are related to fractions. Along the way, find decimals on the number line, convert between fractions and decimals, and compare decimals. (1) Intro to decimals Intro to decimals Decimals as words Decimals in words Writing decimal numbers shown in grids Write decimal numbers shown in grids […]

Fractions (Khan Academy)

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Learn how to do basic arithmetic with fractions (add, subtract, and multiply). Also learn about mixed numbers and equivalent fractions, and use this knowledge to compare fractions with unlike denominators. (1) Equivalent fractions Intro to equivalent fractions Visualizing equivalent fractions Equivalent fractions (fraction models) More on equivalent fractions Equivalent fractions Equivalent fractions and different wholes […]

Multiplication and division (Khan Academy)

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Let’s continue on the multiplication and division adventure that was started in third grade. We’ll think about multiplying and dividing with whole numbers and discover that sometimes we have a leftover, or a remainder, when we divide. These tutorials will also help you get comfortable with multiplying multi-digit numbers, long division, and solving word problems. […]

Addition and subtraction (Khan Academy)

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Fourth grade is the time to really fine-tune your addition and subtraction skills to the point that you can add and subtract pretty much any multi-digit, whole number! (1) Adding multi-digit numbers Adding 3-digit numbers Adding with regrouping Adding 3-digit numbers with regrouping Add within 1000 (2) Subtracting: multi-digit numbers Subtracting 3-digit numbers (regrouping) 1 […]

Geometry (Khan Academy)

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Learn about triangles, circles, rectangles, and other shapes. (1) Basic shapes Cousin Fal’s shape collection Recognizing shapes Name shapes 1 Relative position Name shapes 2 Name shapes 3 (2) Properties of shapes Cousin Fal’s shape collection Recognizing shapes Compare shapes Name shapes 4 (3) Composing shapes Composing shapes Compose shapes (4) Fractions of shapes Halves […]

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 1000 (Khan Academy)

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Learn to add and subtract two- and three-digit numbers within 1000. (1) Adding 1s, 10s, and 100s Adding 10 or 100 Adding 1s, 10s, and 100s Add 10s and 100s (no regrouping) Adding 3-digit numbers (no regrouping) Add 2- and 3-digit numbers (no regrouping) (2) Subtracting 1s, 10s, and 100s Subtracting 1, 10, or 100 […]

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. […]

Addition and subtraction within 20 (Khan Academy)

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Learn to add and subtract numbers that are 20 or less. (1) Addition within 20 Adding 7 + 6 Adding 8 + 7 Add within 20 Adding 5 + 3 + 6 Add 3 numbers (2) Subtraction within 20 Subtracting 14 – 6 Subtract within 20 (3) Equal sign Equal sign Equal sign (4) Missing […]

Place value (tens and hundreds) (Khan Academy)

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Learn about tens and hundreds. Compare 2-digit and 3-digit numbers. (1) Teens Teens as sums with 10 Teen numbers: monkeys Teen numbers (2) Tens Intro to place value Place value example: 25 Place value example: 42 Groups of ten objects Tens and ones 2-digit place value challenge (3) Comparing 2-digit numbers Greater than and less […]