Place value and rounding (Khan Academy)

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We’ve been exploring place for a while, thinking about ones, tens, and hundreds. But now we’re ready to tackle all whole numbers, including numbers in the thousands, millions, and beyond! (1) Intro to place value Finding place value Intro to place value Creating the largest number Creating largest or smallest number Place value blocks (2) […]

Factors, multiples and patterns (Khan Academy)

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We know that 3x2x5 = 30. So 2, 3, and 5 are factors of 30. 30 is a multiple of each of 3, 2, and 5. If a number only has itself and 1 as factors, then the number is “prime”. Don’t worry, this is explained in much more depth in the tutorials in this […]

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 […]

Khan Academy

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Khan Academy is perhaps the best known free collection of online courses. The subjects span a great range of topics, including everything from math and science to art history. According to their about page: Our mission is to provide a free, world‑class education for anyone, anywhere. A full list of the subjects they offer is […]