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B. Subtract the numbers:

(a) Th H T O (b) Th H T O (c) Th H T O

9 7 2 8 9 9 9 9 5 8 8 3
– 5 1 1 6 – 8 7 6 9 – 2 0 5 1

(d) Th H T O (e) Th H T O (f) Th H T O

4 6 1 9 6 1 8 4 9 3 2 8
– 2 3 0 8 – 2 0 7 3 – 2 1 1 6

(g) Th H T O (h) Th H T O (i) Th H T O

4 2 6 0 2 1 1 4 6 8 1 7

– 1 0 3 0 – 1 0 0 3 – 2 7 0 6

(j) Th H T O (k) Th H T O (l) Th H T O

9 3 6 7 7 5 9 6 8 5 2 7

– 7 2 0 4 – 2 3 4 6 – 5 4 0 6

SUBTRACTION OF FOUR-DIGIT NUMBERS (BORROWING TENS/HUNDREDS)

Example: Subtract 3586 from 7854.

Solution: (i) We cannot subtract 6 ones from 4 ones. Th H T O

We borrow 1 ten from 5 tens leaving 4 tens 14
regroup 1 ten 4 ones = 14 ones 7 4 14
7 8 5 4
14 ones – 6 ones = 8 ones
– 3 5 8 6

(ii) Borrow 1 hundred from 8 4 2 6 8
hundreds leaving 7 hundreds.

1 hundred 4 tens = 14 tens

14 tens – 8 tens = 6 tens

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Subtraction
Mathematics-3