Page 22 - Start Up Mathematics_3

(c) 2105, 3105, , , ,

(d) 4999, 5999, , , ,

4. Match the following.

Column A Column B

(a) 4 more than 2096 (i) 3999

(b) 1 less than 4000 (ii) 7785

(c) 10 less than 9989 (iii) 2100

(d) 100 more than 7685 (iv) 3075

(e) 100 less than 3175 (v) 5940

(f) 1000 more than 5893 (vi) 6893

(g) 1000 less than 6940 (vii) 9979

Rounding Off Numbers There are about 40

When we are not sure of the exact number, we use birds on this tree.

the word about. It gives a rough estimation of the
number. We can also say that the number has been
rounded off. We can round off a number to the
nearest 10, 100 or 1000.

Rounding off to the nearest 10

To round off a number to the nearest ten, look at the digit at the ones place.

• If the digit at the ones place is 4 or less, then place a zero at the ones place
and let the digit at the tens place remain as it is.
• If the digit at the ones place is 5 or more, then place a zero at the ones place.

Also add 1 to the digit at the tens place.

Example 4: Round off (a) 43, (b) 87 and (c) 65 to the nearest 10.

Solution: (a) 43 is rounded off to 40 since the digit at the ones place is 3 which
is less than 5.

14