Page 34 - Start Up Mathematics_4

EXERCISE 3.1

1. Add the following numbers.

(a) 25,173 and 37,045 (b) 3,09,278 and 5,63,197 (c) 63,971 and 2,108
(d) 1,38,026 and 219 (e) 4,20,153 and 75,692 (f) 84,736 and 99

(g) 14,285 and 1,834 (h) 37,542 and 8,01,342 (i) 85,321 and 7,037

2. Write the addends and the sum obtained.
(a) 4,00,723 + 3,68,912 (b) 2,89,916 + 6,30,249 (c) 75,648 + 28,503

(d) 63,254 + 29,046 (e) 2,20,496 + 3,406 (f) 6,10,420 + 2,42,108
3. Add and write the answer in words.

(a) Thirty-five thousand four hundred twelve and fifty-two thousand six hundred
ninety
(b) Four lakh ninety thousand three hundred sixty and two lakh twenty-six thousand
seven hundred eighty-four

(c) Three lakh forty-six thousand seven hundred forty-two and two lakh sixty-seven
thousand eight hundred fifty-nine
4. Tick the number in the inner circle which is the sum of the numbers given in the outer
circle.

(a) 23,175 (b) 6,50,250

32,925 6,90,275

32,295 6,90,750

33,295 6,91,550

9,120 40,025

Addition of Three or More Numbers

We add three or more large numbers in the same way we add two numbers.

Example 5: Add 7,26,438; 2,19,756 and 38,437. Common Mistake!
Solution: L TTh Th H T O 1 1 1 1

7 2 2 1 6 1 4 2 3 8 8 2 6 4 5
+ 7 9 8 6
2 1 9 7 5 6 1 8 0 6 3 1 ()

+ 3 8 4 3 7 Add the carry over and
do not combine it with
9 8 4 6 3 1 the digit to form a 2-digit

So, 7,26,438 + 2,19,756 + 38,437 = 9,84,631. number.

26