Page 28 - Start Up Mathematics_5

(b) TL L TTh Th H T O
? 3 ? 0 0 ? 8

+ 4 ? 8 7 ? 9 3
7 3 5 ? 7 4 ?

(c) TC C TL L TTh Th H T O
9 ? 7 ? 1 ? ? 6

+ ? 4 6 ? 9 ? 9 7 ?
2 ? 0 7 0 0 5 2 2

(d) TC C TL L TTh Th H T O
6 5 ? ? 0 8 5 ? 3

+ 2 ? 9 8 5 7 ? 8 ?
? 5 0 5 ? ? 0 0 2

3. Verify by adding.

(a) 68,275 + 1,39,420 = 1,39,420 + 68,275
(b) 2,31,610 + 5,08,720 = 5,08,720 + 2,31,610
(c) (3,04,51,608 + 2,91,43,175) + 89,75,650 = 3,04,51,608 + (2,91,43,175 + 89,75,650)

(d) (71,34,291 + 15,29,057) + 9,27,750 = 71,34,291 + (15,29,057 + 9,27,750)

Subtraction

We subtract 7, 8 and 9-digit numbers in the same way as we subtract numbers smaller than
them.

Subtraction (without borrowing)

Example 6: Subtract 1,34,27,605 from 5,87,39,825.
Solution: C TL L TTh Th H T O

5 8 7 3 9 8 2 5
– 1 3 4 2 7 6 0 5

4 5 3 1 2 2 2 0

So, 5,87,39,825 – 1,34,27,605 = 4,53,12,220.
Example 7: Subtract 28,10,25,703 from 49,52,48,926.

Solution: TC C TL L TTh Th H T O
4 9 5 2 4 8 9 2 6

– 2 8 1 0 2 5 7 0 3
2 1 4 2 2 3 2 2 3

So, 49,52,48,926 – 28,10,25,703 = 21,42,23,223.

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