Class Notes NCERT Solutions for CBSE Students
C. Rounding off Quotients
In this example of division, you can never reach a reminder of zero. In such cases, the quotient is usually rounded.
(a) 2.5÷3 = ?
0.83 rounded off to the nearest tenth is 0.8 since the digit in the hundredths place in less than 5.
2.5÷3 = 0.8
(b) 5.43÷8 = ?
0.678 rounded to the nearest hundredth is 0.86, since the thousandths place is more than 5.
5.43÷8 = 0.68
(c) 0.75 rounded to the nearest tenth = 0.8
(d) 1.592 rounded to the nearest hundredth = 1.59
Division by 10, 100, 1000
Look for a pattern. Watch the decimal points.
(a) 821.5÷10 = 82.15
(b) 821.5÷100 = 8.215
(c) 821.5÷1000 = 0.8215
What do you observe?
Remember this rule by counting the zeros. Move the decimal point to the left as many places as there are zeros.
(d) 4÷10 is the same as 4.0÷10.
So 4÷10 = o.4
(e) 2.35÷100 = 0.0235
