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Add 9 and 4 using the composition and decomposition of 10 strategy.

Mathematics

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Answer

10+3=1310 + 3 = 13

Step-by-step solution

4 steps

Okay, let's solve the problem under "2 Understand".

Here's how to find the total number of children:

  1. Write the expression for the total number of children.

    9+49 + 4

  2. Use the composition and decomposition of 10 strategy.

    Decompose 4 into 1 and 3.

    9+4=9+(1+3)9 + 4 = 9 + (1 + 3)

  3. Add 9 and 1 to make 10.

    (9+1)+3=10+3(9 + 1) + 3 = 10 + 3

  4. Add 10 and 3.

    10+3=1310 + 3 = \boxed{13}

    There are 13 children altogether.

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