Video: Adding Tens to Tens

Add to find the total. 7 + 2 = _. 70 + 20 =_.

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Video Transcript

Add to find the total: seven plus two, 70 plus 20.

Seven plus two is nine, and 70 plus 20 is 90. Can you spot the pattern? Seven times 10 is 70, two times 10 is 20, and nine times 10 is 90. 70 is 10 times bigger than seven. 20 is 10 times bigger than two. So 90 is 10 times bigger than nine. The answer is nine and 90.

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