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Monday, 19 February 2018

Solving addition and subtraction problems by making tidy number.

WALT - Solve addition and subtraction problems by making tidy number.


SUCCESS CRITERIA
  • I can make one number to a tidy number.
  • Solve the problem by either counting
forward or backward in tens.


I had $53 in my bank account and I saved $18 more.
How much money do I have?
(18 + 2 = 20) (53 - 2 = 51)   20 + 51 = 71.
Tim has $38 and his brother $27. How much money do they have in total?
(38 + 2 = 40) (27 - 2 = 25) 40 + 25 = 65.
There were 73 students in the library. Then 21 more students arrived at the library. How many students are in the library?
(73 - 3 = 70) (21 + 3 = 24) 70 + 24 = 94.
This is just part of what I did in Maths when we revise some of the addition and subtraction strategies.

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