Understanding Doubles Plus One

What is a doubles fact in mathematics?

• Multiplying a number by two

• Adding two different numbers to get a sum

• Adding a number to itself to get a sum

• Subtracting a number from itself

How can doubles facts help in solving other addition problems?

• By providing a base to add one more

• By making subtraction easier

• By helping in multiplication

• By simplifying division

What is the result of 4 + 5 using the doubles plus one method?

• 8

• 9

• 11

• 10

Which doubles fact can help solve 2 + 3?

• 2 + 2

• 3 + 3

• 5 + 5

• 4 + 4

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

• 12

• 11

• 14

• 13