# 2-28 Two-Digit Addition

### Lesson List

One TEN equals 10 ones.

 10 =

In the number 15 there is one group of ten and five ones.

 15 = 10 + 5

When you add numbers you may need to make 10 ones into 1 ten. This is called regrouping.

For example: 7 + 6 = 13, or 1 ten and 3 ones.

Regroup the following numbers.

 7 + 6 = 13 or 1 ten and ones. 8 + 4 = 12 or 1 ten and ones. 9 + 6 = 15 or 1 ten and ones. 8 + 9 = 17 or ten and  ones. + 7 = 11 or ten and 1 one. + 9 = 14 or 1 ten and  ones. 8 + = 17 or ten and ones. 6 + = 11 or ten and ones. 1 ten and  ones or 10 + = 17 1 ten and ones or 7 + 9 = 1 ten and ones or + 4 = 13 2 tens and  ones or + 12 = 24

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