Doubles and near doubles

Front

What is the result of doubling a number?

Back

Doubling a number means multiplying it by 2.

Front

What is the near double of 5?

Back

The near double of 5 is 10, which is 5 doubled, plus 1.

Front

Calculate 5 + 5.

Back

5 + 5 = 10.

Front

Calculate 5 + 6 using the near doubles concept.

Back

5 + 6 can be thought of as 5 + (5 + 1) = 11.

Front

What is the result of 4 + 4?

Back

4 + 4 = 8.

Front

What is the result of 9 + 9?

Back

9 + 9 = 18.

Front

How can you use doubles to solve 4 + 5?

Back

4 + 5 can be solved by recognizing that 4 + 4 = 8, then adding 1 more to get 9.

Front

What is the definition of a double in mathematics?

Back

A double is the result of multiplying a number by 2.

Front

What is the sum of 4 and 5?

Back

4 + 5 = 9.

Front

Explain the concept of near doubles in addition.

Back

Near doubles involve using a known double to help calculate an addition problem that is one more or one less than that double.