Skill: Use near doubles

Explanation and Free Practice Resources

Near-doubles reasoning identifies two addends that differ by one and relates their sum to a known double: for example, 6 + 7 can be found from 6 + 6 by adding one. Within sums to 20, this relationship supports efficient mental addition and helps connect addition facts with related subtraction facts, without extending to larger numbers or generalized algebraic rules.

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Detailed Explanation: Use near doubles

Near doubles are two numbers that are next to each other, such as $6$ and $7$ . Start with the easier double, then add $1$ .

Example:

6+7

Notice that $7$ is one more than $6$ .
Think of the double $(6+6)$ :

6+6=12

Add the extra $1$ :

12+1=13

So,

6+7=13

You can also think of it as $(7+7=14)$ , then take away $1$ , which also gives $(13)$ .

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Addition - Whole Number - Near Doubles - Column

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