Near Doubles (or Using Doubles)
You might hear this strategy being called near doubles or using doubles. Both mean the same thing!
For addition, this means adding numbers that are near each other. Students use their knowledge of doubles to help them add these facts.
Example - 4+5 is a near doubles fact. The students can solve this in two different ways.
- Students will double the smallest number, which is 4 in this case. When you double 4, you get 8. That is the same thing as 4+4. So you know that instead of adding the second 4, you really want to add 5, which is just 1 more than 4. So to solve 4+5 students would think of 4+4+1 which equals 9, so 4+5=9.
- Students will double the largest number, which is 5 in this case. When you double 5, you get 10. That is the same thing as 5+5. So you know that instead of adding the second 5, you really want to add 4, which is just 1 less than 5. So to solve 4+5 students would think of 5+5-1 which equals 9, so 4+5=9.
Need to see a video example?
LearnZillion has great videos for some of the concepts/strategies we teach. You can view these at home for free! Click {here} to take you to a video about the near doubles strategy.
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Here is another video on YouTube that shows the near doubles strategy.
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