Subtraction by counting on

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Presentation transcript:

Subtraction by counting on Key Words Subtraction = taking away

Lesson Aim: To know how to subtract numbers to 100 by counting on

How do you solve 99-45 by counting on? 99 ?

We count on. Here is how….. Think !

We added 5+40+9= 54 99-45=54 45+5=50 50+40=90 90+9=99 add 5 add 40 add 9 45 50 90 99

starts with the number being taken away Counting on always: starts with the number being taken away ends with the number that has something taken away from it WE find the DIFFERENCE between the two numbers. If you need more help please ask now…..

Solve these by counting on 78-89= 94-56= 67-53= 88-32=