Skill: Use near-doubles facts

Explanation and Free Practice Resources

Near-doubles reasoning treats an addition fact with consecutive addends as a known doubles fact adjusted by one: $7+8$ can be found from $7+7+1$ or $8+8-1$ . This supports flexible recall of addition and related subtraction facts within 20 and develops decomposition and recombination of quantities; it does not include generalized strategies for larger numbers or formal algebraic treatment.

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Detailed Explanation: Use near-doubles facts

When two numbers are next to each other, use a near-doubles fact. Start with the doubles fact you know, then add or subtract $1$ .

Example: Find $7+8$ .

Notice that $7$ and $8$ are next to each other.
Use the doubles fact $7+7=14$ .
Since $8$ is one more than $7$ , add $1$ :

7+8=7+7+1

Solve:

14+1=15

So,

7+8=15.

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Addition - Whole Number - Near Doubles

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