Doubles Facts in Math

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Questions and Answers

What is the definition of doubles facts in the context of the 'doubles plus 1' strategy?

Basic multiplication facts where two identical numbers are multiplied together
Basic addition facts where two identical numbers are added together (correct)
Basic addition facts where two identical numbers are multiplied together
Basic subtraction facts where two identical numbers are subtracted

What is the result of 7 + 7 according to the key doubles facts?

14 (correct)
16
12
18

If you know that 3 + 3 = 6, what is the result of 3 + 4?

7 (correct)
8
6
9

What is the purpose of memorizing doubles facts in the 'doubles plus 1' strategy?

<p>To quickly calculate basic addition and subtraction facts (A)</p> Signup and view all the answers

What is the result of 9 + 9 according to the key doubles facts?

<p>18 (D)</p> Signup and view all the answers

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Study Notes

Doubles Facts in "Doubles Plus 1"

Doubles facts are a fundamental concept in the "doubles plus 1" strategy, which is a mental math technique used to quickly calculate basic addition and subtraction facts.

What are Doubles Facts?

Doubles facts are basic addition facts where two identical numbers are added together (e.g., 2 + 2, 5 + 5, 8 + 8).
These facts are easily memorized and serve as a foundation for more complex calculations.

Key Doubles Facts:

0 + 0 = 0
1 + 1 = 2
2 + 2 = 4
3 + 3 = 6
4 + 4 = 8
5 + 5 = 10
6 + 6 = 12
7 + 7 = 14
8 + 8 = 16
9 + 9 = 18
10 + 10 = 20

Importance of Doubles Facts in "Doubles Plus 1"

Knowing doubles facts allows for quick calculation of "doubles plus 1" problems.
By adding 1 to a doubles fact, you can easily calculate the answer to a "doubles plus 1" problem.
For example, if you know that 5 + 5 = 10, you can quickly calculate that 5 + 6 = 11 (10 + 1).