Page 110 - Maths Class 05

2. Write the one step operation you would use to change these numbers.

a. 24 to 0.24 ÷100 b. 4 to 0.004
c. 9.73 to 0.0973 d. 6.2 to 0.62

e. 87.53 to 8.753 f. 89 to 0.089

3. A member of the school track team ran for a total of 179.3 miles in practice over 61.5

days. About how many miles did he cover per day ?
4. Divide.

a. 2.64 by 0.4 b. 0.0461 by 0.4 c. 17.152 by 3.2 d. 5.25 by 0.6
e. 0.345 by 1.5 f. 16.506 by 0.063 g. 1.995 by 0.57 h. 9.561 by 1.7

5. Find the quotient.
a. 0.081 ÷ 0.09 b. 0.0018 ÷ 0.09 c. 0.0144 ÷ 0.0018 d. 0.0784 ÷ 0.028

e. 0.049 ÷ 0.7 f. 0.0529 ÷ 0.23 g. 0.0625 ÷ 0.25 h. 0.324 ÷ 1.8

6. Divide.
a. 306 ÷ 3.4 b. 306 by 1.7 c. 27 by 0.03 d. 39 by 1.3

e. 650 by 0.26 f. 8 ÷ 0.016 g. 196 ÷ 1.4 h. 324 by 1.8

Rounding Off Decimals

We know how to round off numbers. Now, we shall learn about ‘rounding off’ the

decimals.
Rounding off a Decimal to the Nearest One

« First, examine the tenths place digit.

« If the tenths place digit is less than 5, then replace each digit after decimal point
with 0 and do not make any changes to the digits before decimal point.

« If the tenths place digit is 5 or greater than 5, then increase the ones place digit by
1 and replace each digit after decimal point with 0.

Example : Round off the following decimals to the nearest one :

a. 5.46 b. 31.62 c. 252.56

Digit at tenths
place is less than 5.
Solution : a. Given decimal = 5. 4 6

So, replace each digit after decimal point with 0.

\ Rounded off number of 5.46 = 5.00.

Mathematics-5 110