Doubles Strategy in Addition

The video tutorial explains the doubles plus one and doubles minus one strategies for addition. It demonstrates how to use these strategies with examples like four plus five, four plus three, six plus seven, and nine plus eight. The video encourages viewers to apply these strategies to simplify addition problems and concludes with a call to action to like and subscribe.

What is the main idea behind the doubles plus one strategy?

• Adding one to a known doubles fact

• Adding two numbers that are the same

• Subtracting one from a known doubles fact

• Multiplying two numbers

In the example of 4 + 5, what doubles fact is used?

• 5 + 5

• 3 + 3

• 4 + 4

• 6 + 6

How do you find the sum of 4 + 5 using the doubles plus one strategy?

• Multiply 4 by 2

• Add 1 to 4 + 4

• Subtract 1 from 4 + 4

• Add 2 to 4 + 4

What is the result of 4 + 3 using the doubles minus one strategy?

• 9

• 7

• 8

• 6

Which doubles fact is used to solve 4 + 3 using the doubles minus one strategy?

• 4 + 4

• 6 + 6

• 5 + 5

• 3 + 3

What is the sum of 6 + 7 using the doubles plus one strategy?

• 12

• 13

• 14

• 15

Which doubles fact is used to solve 6 + 7 using the doubles plus one strategy?

• 6 + 6

• 7 + 7

• 8 + 8

• 5 + 5

How do you find the sum of 6 + 7 using the doubles minus one strategy?

• Add 1 to 7 + 7

• Subtract 2 from 6 + 6

• Add 2 to 6 + 6

• Subtract 1 from 7 + 7

What is the result of 9 + 8 using the doubles minus one strategy?

• 16

• 17

• 18

• 19

Which doubles fact is used to solve 9 + 8 using the doubles minus one strategy?

• 6 + 6

• 9 + 9

• 7 + 7

• 8 + 8