Q. Solve the following (try to solve mentally):
a) 9 2 7 4
– 5 6 4 4
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b) 3 8 4 7
– 3 5 2 8
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c) 5 6 4 4
– 4 2 3 4
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d) 8 8 5 2
– 4 8 4 1
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e) 9 7 6 4
– 5 7 3 7
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f) 9 7 7
– 7 1 6
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g) 9 4 4 4
– 7 2 3 9
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h) 6 9 8 4
– 2 1 4 4
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i) 4 4 5 5
– 3 3 2 2
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