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Question

Place the cards in the right boxes in the given boxes.
(a)

(b)

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Solution

(a) As we know that addition is commutative ie. a+b=b+c, therefore,

50+20=70 and 20+50=70

Also, in subtraction, we subtract from the biggest positive number to get a positive answer.

7050=20 and 7020=50



(b) We can solve this similarly as part (a). Therefore,

30+12=42 and 12+30=42

Also,

4230=12 and 4212=30


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