Geometry (Khan Academy)

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Finally, we’re getting to geometry. We’ve been waiting for this and hope you have been, too. The foundation of all geometry is the line–so that’s a great place to start. From there we’ll move into angles, quadrilaterals, and triangles. Our goal here is to get familiar with the basic concepts, skills, and applications of geometry. […]

Measurement and data (Khan Academy)

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When we measure anything, we do it in human-defined ‘units’. Different units were defined in different places and for different scales. The two most common are U.S. customary units and metric units. Let’s think about how to convert between and among them! We’ll also continue thinking about perimeter and area! (1) Estimating mass Metric system: […]

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. […]