Adapted:Learning+

Powerful Maths Methods to Solve Challenging Problem Sums 1 & 2© Singapore Asia Publishers Pte Ltd. All rights reserved.Reproducible for home/classroom use only.STRICTLY NOT FOR SALE.Look for other useful resources: www.sapgrp.com

1

I am thinking of a number. When I add 8 to it, the answer is 67. What is the number?

Solution: + 8 = 67

67 – 8 = 59 Answer: 59

Example

Working Backwards

1 I am thinking of a number. When I subtract 7 from it, I get 43. What is the number?

Answer:

Teacher’s commentWork the sum backwards. Add 7 to 43 to find the number at first.

EL_Working Backwards.indd 1 2019/6/26 11:16:16

Adapted:Learning+

Powerful Maths Methods to Solve Challenging Problem Sums 1 & 2© Singapore Asia Publishers Pte Ltd. All rights reserved.Reproducible for home/classroom use only.STRICTLY NOT FOR SALE.Look for other useful resources: www.sapgrp.com

2

Solutions:1 – 7 = 43 7 + 43 = 50 Answer: 50

2 × 8 = 56 56 ÷ 8 = 7 Answer: 7

Learn more maths methods from this book!

Primary 1&2

to Solve Problem SumsChallengingChallenging

Introduces extensive methods, concepts, thinking skills and heuristics essential for solving problem sumsTeacher’s comments to guide thinking processNon-routine questions to invoke out-of-the-box thinkingAdditional digital resources to complete learning experienceSolutions to develop the critical thinking process

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2 I am thinking of a number. When I multiply 8 to the number, the answer is 56. What is the number?

Answer:

Teacher’s commentWork backwards. Divide 56 by 8 to find the number at first.

EL_Working Backwards.indd 2 2019/6/27 18:10:02