ROUNDING OFF WHOLE NUMBERS P.5

Rounding off means taking a given place value to another level.

When rounding off, we consider that if the digit on the right of the required place value is less than 5 we add to it 0 and replace all digits on it’s right with 0’s.

If the figure on the right of the place value is 5 or more add one to it.

Example

Round off 214 to the nearest tens.

                   H       T        O

2        1        4

0

2        1        4        =       210

Example II

Round off 7591 to the nearest thousands.

REFERENCE:        Mk bk 6 pg 47

                             Mk bk 5 pg 20

                             Macmillan bk 5 pg 22 – 24.

ROUNDING OFF DECIMALS

Example

1)       Round of 31.46 to the nearest tenths.

31.46

1

31.5

NB:    When rounding off decimals the digits on the right of the place value rounded off are not replaced.

2)       Round off 4.169 to the nearest whole number.

Note: nearest whole number also means the place of ones.

                   4.169

0

                   4.000

4.169 ≈ 4

NB:  

REFERENCE:        Understanding MTC bk 6 pg 25-26

Mk bk 6 pg 48.