Page 78 - SK Year 5 Mathematics DLP
P. 78
ROUNDING OFF DECIMALS
1 SHOT-PUT EVENT
Athlete's name: Asmat
Record Distance
current 10.17 m
previous 9.85 m
a Round off 10.17 m to one
decimal place.
Method 1
10.10 10.11 10.12 10.13 10.14 10.15 10.16 10.17 10.18 10.19 10.20
10.17 is between 10.10 and 10.20.
10.17 is nearer to 10.20 compared to 10.10.
10.17 becomes 10.2 when rounded off to one decimal place.
Method 2
one decimal place Identify the Look to the digit The digit
+ 1 digit at one on the right of 1. If next to 2
decimal place, it is 5 to 9, add 1 becomes
1 0 . 1 7 which is 1. to digit 1. 0.
1 0 . 2 0
Ignore 0.
10.17 m becomes 10.2 m when rounded off
to one decimal place.
b Round off 9.85 m to one decimal place.
9.80 9.81 9.82 9.83 9.84 9.85 9.86 9.87 9.88 9.89 9.90
9.85 m becomes m when rounded off to one decimal place.
70 • Emphasise that the method of rounding off decimals and
2.2.1
whole numbers is similar.
