Adding and Subtracting Tens

In this movie, you’ll learn how to add and subtract tens and solve sentences that use two-digit numbers. You can skip-count by tens or use a number line or hundred chart. You can hide zeroes to help you add or subtract, or use doubles facts to help you find the sum or difference. Use what you know about adding and subtracting tens to add or subtract 9 or 11. What is 40- 11? Watch the movie to learn different strategies to solve.

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