Video: Addition Strategies for Sums up to 20: Doubles Plus Two

We can use doubles facts to help us add. What is double 6? Use the doubles fact to find 6 + 8.

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Video Transcript

We can use doubles facts to help us add. What is double six? Use the doubles fact to find six plus eight.

In this question, we’re using doubles facts to help us add. The doubles fact we’re thinking about is double six. So we need to calculate six plus six or double six. This bar model represents six plus six or double six. To help us add six and six, first we could start at six and add four more to make 10. Then we can add the final two to make 12. So now we have our doubles fact. Double six or six plus six equals 12.

Now we can use this doubles fact to find six plus eight. Eight is two more than six. So to find six plus eight, we need to add two more to double six. What is 12 plus two? The answer is 14. 12 plus two is 14.

We used doubles facts to help us add. First, we found double six, which is 12. Then we used this doubles fact to find six plus eight. Six plus eight is the same as double six plus two. And 12 plus two equals 14. Double six is 12, and six plus eight is 14.

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