Mental Addition Strategies

Everyone has a different thinking strategy. But it’s important that we encourage children to make their own strategies.

Some of the most observed strategies are

Doubles

Seven when taken 2 times gives us 14.

For example 7 + 7 = ?

Doubles Plus One

Seven and seven makes 14, so the answer will be one more than 14, i.e. 15.

For example 7 + 8 = ?

Eight and two are 10, and 4 more makes it 14.

For example 8 + 6 = ?

Bridging through 10

Compensation

If we take away 1 from 9 and give it to 7, then 7 and 1 makes 8 and 9 minus 1 makes it 8.  Eight and Eight makes 16.

For example 7 + 9 = ?

Twelve take away 2 is 10. Then take away 3 from 10 and that gives us 7.

For example 12-5 = ?

Subtracting through 10

Nine is One Less than 10

Ten and seven makes 17, the answer will be one less than 17, i.e. 16.

For example 9 + 7 = ?

Eight and two makes 10, and adding 5 to it gives us 15.

For example 8+5+2 = ?

Reordering

Many a times children are able to come up with these strategies on their own. But when they find it difficult to do, we can explicitly teach them.

Mental Addition Strategies