Video: Adding within 100 Including Adding Two-Digit Numbers to a Multiple of 10

Kerrie Lynskey

Add 40 to 55. Fill in the blank. 40 + 55 = _.

00:51

Video Transcript

Add 40 to 55. Fill in the blank: 40 plus 55 equals the missing number.

We can use a place value chart to help us add the two numbers. We have to add 40 to 55. First, we can add the ones.

55 has five ones and 40 has no ones. So five add nothing equals five. Now, let’s add the tens. Five tens plus four tens equals nine tens. 40 plus 55 equals 95.

The missing number is 95.

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