This video tutorial teaches how to use addition to perform subtraction by counting on. It explains the concept of increasing and decreasing numbers on a number line and a hundreds chart. The tutorial provides examples of finding differences between numbers using counting on, both on a number line and a hundreds chart. It includes practical examples like subtracting flowers in a garden and gumballs in a machine. The lesson concludes with a summary of the subtraction method taught.

What happens to numbers as you move to the right on a number line?

• They disappear

• They increase

• They stay the same

• They decrease

On a hundreds chart, how do tens change as you move vertically?

• They double

• They stay the same

• They decrease

• They increase

What is the difference between 8 and 20 when counting on?

• 12

• 15

• 18

• 10

How many spaces do you count on a hundreds chart to find the difference between 12 and 19?

• 7

• 8

• 6

• 5

If there are 19 flowers and 12 are picked, how many are left?

• 5

• 6

• 8

• 7

How many gumballs are left if 13 are bought from a machine with 30?

• 15

• 16

• 17

• 18

What is the first step in finding the difference between 13 and 30 on a number line?

• Count back 7 spaces

• Count on 7 spaces

• Count back 10 spaces

• Count on 10 spaces

What is the final step to find the difference between 13 and 30?

• Count on 10 spaces

• Count back 10 spaces

• Count on 7 spaces

• Count back 7 spaces

What is the difference between 30 and 13?

• 16

• 15

• 17

• 18

What concept is used to subtract by counting on?

• Division

• Subtraction

• Addition

• Multiplication