Video: Testing Equivalent Addition Expressions

Fill in the blank: 11 + 3 = _ + 8.

01:30

Video Transcript

Fill in the blank, 11 plus three equals what plus eight.

We’re given two equal expressions. One of the numbers from the second expression is missing. To help us find this missing number, first we need to find the sum of 11 and three. 11 plus three equals 14. We know that our missing number plus eight also equals 14. Let’s count on from eight to 14 to find the missing number, nine, 10, 11, 12, 13, 14. The difference between eight and 14 is one, two, three, four, five, six. So, our missing number is six. 11 plus three is equal to six plus eight. 11 plus three make 14. And six plus eight make 14. The missing number is number six.

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