Balancing Algorithm For Subtraction Matthew has 12 Hot Wheels in his collection His little brotherJason has 8 in his collection How Many more cars does Matthew have than Jason For Christmas their Grandma gives both Matthew and Jason 4 Hot Wheels each ID: 290513
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Slide1
Megan Ruestman
“Balancing” Algorithm For SubtractionSlide2
Matthew has 12 Hot Wheels in his collection. His little brotherJason has 8 in his collection. How Many more cars does Matthew have than Jason?Slide3
For Christmas, their Grandma gives both Matthew and Jason 4 Hot Wheels each.
How many cars do they each have now?
How Many more does Matthew have than Jason?Slide4
Matthew and Jason’s cousin Tommy comes over to play, but doesn’t have any cars. Matthew and Jason each give Tommy 2 of their cars.
How many more cars does Matthew have than Jason now?Slide5
Are you noticing a trend?Slide6
The Balancing Algorithm for subtraction says…
If you add or subtract the
same
amount to both numbers (in a subtraction problem), the difference will remain the same.Slide7
____________19___________________________37______
37 - 19
+
1Slide8
Much Friendlier numbers
Slide9
Kara has 47 dolls. Her friend Bailey only has 28 dolls. How many more dolls does Kara have than Bailey?
Can these be made into friendlier numbers?Slide10
47 – 28
+2
49 - 30
Kara has more dolls than Bailey!
19