Expanded Form
Ones and Tens are the place values of 2-digit numbers.
1 0
= 10
Tens Ones
10 ones make 1 ten.
make
10 Ones 1 Ten
Now, look at the following.
Tens Ones Number Tens Ones Number
1 1 = 11 1 6 = 16
1 2 = 12 1 7 = 17
1 3 = 13 1 8 = 18
1 4 = 14 1 9 = 19
1 5 = 15 2 0 = 20
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