Learning to Add and Subtract Using Doubles

This video tutorial teaches the concept of doubles in mathematics, focusing on how they can be used to simplify addition and subtraction. It begins with an introduction to doubles, followed by examples of basic doubles facts. The tutorial then explores efficient counting strategies using doubles, and demonstrates how to add and subtract numbers that are almost doubles. The lesson also covers the concept of doubles plus more than one, providing a comprehensive understanding of how doubles can be applied in various mathematical operations.

What is a doubles fact?

• A fact where two numbers are multiplied.

• A fact where a number is subtracted from itself.

• A fact where two different numbers are added.

• A fact where the same number is added to itself.

How can doubles help in adding numbers that are almost doubles?

• By multiplying the double by two.

• By adding one to the double.

• By subtracting one from the double.

• By dividing the double by two.

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

• 8

• 9

• 11

• 10

Which doubles fact can help solve 17 - 8?

• 8 + 8 = 16

• 9 + 9 = 18

• 6 + 6 = 12

• 7 + 7 = 14

What is the result of 6 + 8 using the doubles method?

• 15

• 14

• 13

• 12