Page 24 - Maths Skill - 3

22 Maths

Digits Greatest Number Smallest Number

(c) 7, 1, 2, 6

(d) 5, 3, 0, 9
(e) 8, 1, 3, 9

2. Write the successors of the following numbers.

(a) 5345 ______ (b) 7032 ______ (c) 6380 ______ (d) 1899 ______
3. Write the predecessors of the following numbers.

(a) 2450 ______ (b) 6999 ______ (c) 4436 ______ (d) 6543 ______

4. Write the missing numbers in each case.

(a) Count by 2s: 9260, 9262, _________, _________, _________

(b) Count by 10s: 1828, 1838, _________, _________, _________
(c) Count by 100s: 3432, _________, 3632, _________, _________

(d) Count by 1000s: 1525, _________, 3525, _________, _________

Rounding off Numbers
We round off numbers to make calculations easier and faster.

Rounding off the numbers gives a resulting number that is less accurate but easier to use.
Now we will learn rounding off numbers to the nearest ten and nearest hundred.

To the Nearest Ten

� If the digit at ones place is less than 5, round off the number to the same tens.
� It the digit at ones place is equal to or greater than 5, round off the number to the
next tens.

Let’s Attempt

Example 1: Round off 14 to the nearest ten.

Solution:
10 11 12 13 14 15 16 17 18 19 20

14 is nearer to 10 than 20. Thus, it is rounded off to 10.

Example 2: Round off 37 to the nearest ten.

Solution:
30 31 32 33 34 35 36 37 38 39 40

37 is nearer to 40 than 30. Thus, it is rounded off to 40.