Add the Near Doubles – Doubles minus One Strategy

Add the Near Doubles – Doubles minus One Strategy

1. Identify the numbers: We have 4 and 3.
2. Recognize the near double: The near double concept means finding numbers that are close to each other. In this case, 4 and 3 are close to 4 + 4 (which would be doubling 4).
3. Double the larger number: To make this easier, we can first double 4 (since it’s the larger number):4+4=8
4. Adjust the result: Now, we need to adjust since we are adding 3, not 4. The difference between 4 and 3 is 1, so we subtract 1 from the doubled result:8−1=7

So, 4 + 3 = 7.

 

Why this works:

By doubling 4 and adjusting by 1, we use the idea of near doubles, where we make a calculation that’s close to a double and adjust for the small difference. This method helps make the addition faster and easier to mentally calculate.
Quiz:
1) Complete the doubles fact:

2) Complete the doubles fact:

3) Complete the doubles fact:

4) Complete the doubles fact:

5) Complete the doubles fact:

6) Complete the doubles fact:

7) Complete the doubles fact:

8) Complete the doubles fact:

9) Complete the doubles fact:

10) Complete the doubles fact:

Answers:
1) 1
2) 21
3) 13
4) 23
5) 1
6) 25
7) 5
8) 3
9) 29
10) 17