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Suitable for grades 1 - 3, Measure It lets you choose the measurement that matches the length of the bar. Match correctly to win. Play Measure it online, here.

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Add and subtract fractions with unlike denominators

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In this lesson you will learn how to add and subtract fractions with unlike denominators.

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Learn fourth grade math skills for free! Choose from hundreds of topics including multiplication, division, fractions, angles, and more. Start learning now!

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Questions about the difference between primary and secondary sources.