The Math Meridian
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Number bonds to 20

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Learn it A whole can be split into two parts. The two parts add up to the whole.

Example: 15 is split into two parts. One part is 9. What is the other part?

  1. Think: $9 + \square = 15$.
  2. 9 + 1 = 10, then 10 + 5 = 15. That's 1 + 5 = 6.
  3. The other part is 6.

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