Doubles plus 1 - Definition with Examples

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What is doubles plus 1? 
Doubles plus 1 is a strategy used to add two consecutive numbers that is, when they are next to each other. 
We simply add the smaller number twice or double it and then,  add 1 to it, to get the final result. 

Here, for example, consecutive numbers 8 and 9 have been added using the doubles plus one strategy. 

Doubles plus one addition strategy consecutive numbers

Here are more examples of the double plus 1 strategy.

Doubles plus one addition strategy consecutive numbers real life examples

   Fun Facts

  • Doubles plus 1 and doubles minus 1 are also called near doubles strategies. 

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Let’s add consecutive soap bubbles,
Adding five and six; there’s no trouble!
Just make the smaller number double,
Then add 1 to the double of the bubbles. 

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Have fun with your child by asking them to find the doubles of numbers you say and then use double plus 1 and doubles minus 1 strategies to find the sum of consecutive numbers between 1 and 20. 

related math vocabulary Related math vocabulary

Doubles minus 1
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