Rounding to the nearest 10
Rounding to the nearest 100
Rounding to the nearest 1000
Look at the units of a number:
Look at the tens of a number:
Look at the hundreds of a number:
If the value is 5 or higher, round up to
the nearest 10, 4 or lower, round down
to the nearest 10
e.g. 47
unit is 7 (higher than 5)
so round up to 50
32
unit is 2 (lower than 4)
so round down to 30
If the value is 50 or higher round up, if it is
49 or lower round down
If the value is 500 or higher round up,
if it is 499 or lower round down
e.g.
e.g.
Rounding
TTH
2
TH
4
,
179 79 (higher than 50) so round
up to 200
315 15 (lower than 49) so round
down to 300
H
6
Encourage children, when shopping, to estimate
the total bill amount by rounding prices up or
down to the nearest pound.
Rounding to the nearest tenth
(1 decimal place)
T
3
U
3
. tenth
.
8
Rounding to the nearest hundredth
(2 decimal places)
Look at the thousandths of a number:
If the value is 0.05 or higher, round
up to the nearest tenth, 0.04 or lower,
round down to the nearest tenth
If the value is 0.005 or higher round up
to the nearest hundredth, if it is 0.004 or
lower round down to the nearest
hundredth
0.47 hundredth is 0.07 (higher
than 0.05) so round up to 0.5
0.32 hundredth is 0.02 (lower
than 0.04) so round down to
0.3
e.g.
hundredth
1
thousandth
9
For amounts of money involving 99p, encourage children to round
up to the next whole pound, add together, and then take away the
pennies at the end e.g 99p + 99p = £1 + £1 = £2 then – 2p = £1.98
Look at the hundredths of a number:
e.g.
4613
613 (higher than
500) so round up to 5000
8059
59 (less than 499)
so round down to 8000
0.179 thousandth is 0.009 (higher
than 0.005) so round up to 0.18
0.313 thousandth is 0.004 (lower
than 0.004) so round down to 0.31
Rounding to the nearest whole number
Look at the tenths of a number:
If the value is 0.5 or higher round up to the
nearest whole number, if it is 0.4 or lower
round down to the nearest whole number
e.g.
0.9 tenths are 0.9 (higher than 0.5) so
round up to 1
1.3 tenths are 0.3 (lower than 0.4) so
round down to 1