Numbers

2-28 Two-Digit Addition

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One TEN equals 10 ones.

 

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=

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

 

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15

=

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10

+

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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.
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8 + 4 = 12 or 1 ten and ones.
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9 + 6 = 15 or 1 ten and ones.
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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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