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c. 46,53,320 by 50 d. 2,24,36,800 by 800
e. 7,56,32,200 by 300 f. 91,55,800 by 40

4. Divide mentally and fill the boxes :
Quotient Remainder

a. 74,732 by 10

b. 3,66,542 by 10
c. 8,32,414 by 1000

d. 24,10,132 by 100
e. 9,10,185 by 1000

f. 11,23,424 by 100

Word Problems on Multiplying and Dividing of Large numbers

Example 24 : The cost of a fan is ` 980.00. Find the
2 0 3 5
cost of such 2035 fans.
× 9 8 0
Solution : Cost of a fan = 980.00
0 0 0 0
Number of fans = 2035
1 6 2 8 0 0
Cost of 2035 fans = 1994300
1 8 3 1 5 0 0
Therefore, cost of 2035 fans is ` 1994300
1 9 9 4 3 0 0

Example 25 : A CFL factory produces 6348 CFLs a day. 6 3 4 8
How many CFLs will the factory produce is 450
× 4 5 0
days?
0 0 0 0
Solution : Number of CFLs produces in one day 6348
3 1 7 4 0 0
Number of days = 450
+ 2 5 3 9 2 0 0
Total number of CFLs will produce in 450 days
2 8 5 6 6 0 0
= 2856600.

Example 26 : 470988 bottles are to be
1 2 4 6 Quotient
arranged equally in racks. If 378
Divisor 378 4 7 0 9 8 8 Dividend
bottles are arranged in each rack,
– 3 7 8 0 0 0
how many racks will be needed?
9 2 9 0 0
Solution : Total number of bottles = 470988
– 7 5 6 0 0
Number of bottles arranged in
1 7 3 8 0
each rack = 378
– 1 5 1 2 0
Number of racks needed = 470988
2 2 6 8
by 378
– 2 2 6 8
Therefore, 1246 racks needed to
0 0 Remainder
arrange 470988 bottles equally.

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Mathematics In Focus - 5