Guo Jialu Benjamin's answer to Lisi's Primary 5 Maths Whole Numbers Singapore question.
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Working backwards might help
1. At the end, Kenneth had 3 times as many cards as Rauf
2. From the model, add the 36 cards Rauf lost and 6 cards Kenneth lost, to get the same original number or cards
3. Visually you should be able to see that 2 units would be 36-6=30 based on the difference
1. At the end, Kenneth had 3 times as many cards as Rauf
2. From the model, add the 36 cards Rauf lost and 6 cards Kenneth lost, to get the same original number or cards
3. Visually you should be able to see that 2 units would be 36-6=30 based on the difference
Date Posted:
4 years ago
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