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Compose and Decompose Numbers: Learn

The numbers from 11 to 19 are composed of ten ones (called a ten) and one, two, three, four, five, six, seven, eight, or nine ones.
10 = 10 + 0 11 = 10 + 1 12 = 10 + 2 13 = 10 + 3 14 = 10 + 4
15 = 10 + 5 16 = 10 + 6 17 = 10 + 7 18 = 10 + 8 19 = 10 + 9

Add to Ten: Practice

What number needs to be added to ten?

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= 10 + ?

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