Michael J. answered 10/18/16
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Great at Simplifying Complex Concepts and Processes
9 tens = 9 x 10 = 90
10 ones = 10 x 1 = 10
So you add 90 and 10 together.
Caridad B.
asked 10/18/16Michael J. answered 10/18/16
Great at Simplifying Complex Concepts and Processes
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