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).

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