Transcript Rounding Numbers to Nearest Whole Number Ch3 LD

Rounding Numbers.
6
8
7
6.3
2035 = 2040
7.2
7.8
67 890 = 68 000
8985 = 9000
6.89 = 6.9
Rounded Numbers All Around You.
Here are some examples of rounded numbers
which could appear in newspaper headlines:
30 000 Watch Scotland Win Again.
500 000 March In War Protest.
Man Leaves £2 Million To Charity.
Rounding To The Nearest Whole Number.
6.7
Consider the number :
It is our task to decide if the number is closer to :
6
or
Look at the number line below:
7
6
6.5 6.7
Mark the number 6.5
7
8
6.5 is the midpoint between 6 and 7.
Mark the number 6.7
Is 6.7 closer to 6 or 7 ?
Is 6.7 above or below 6.5 ?
6.7 = 7 (to the nearest whole number)
Above
Further Example.
Round the following to the nearest whole number:
(1) 24.3
24 24.3 24.5
25
What is the midpoint between 24 and 25 ?
Is 24.3 above or below 24.5 ?
Below.
24.3 = 24 (To the nearest whole number).
26
What Goes In The Box ?
Round the following to the nearest whole number:
NB: always round 0.5 up . Ie 12.5 = 13 (to the nearest whole number).
(1) 4.8
5
(6) 287.6
288
(2) 7.4
7
(7) 9.8
10
(3) 44.6
44
(8) 49.6
50
(4) 87.5
88
(9) 99.7
100
(5) 56.3
56
(10) 399.5
400