Round these to the nearest whole number :(a) £8·30
(b) £7·90
(c) £2·49
(d) £9·61
(e) 7·4 cm
(f) 8·6 cm
(g) 9·8 cm
(h) 2·1 cm
(i) 6·5 kg
(j) 8·71 kg
(k) 12·38 kg
(l) 19·51 kg
Round these numbers to the nearest whole number :– (a) 5·18742 —>
(b) 1·62341 —>
(c) 10·29879 —>
(d) 99·39965 —>
(e) 0·59834 —>
(f) 99·511112 —>
Use your calculator and write down the answers, correct to the nearest whole number :– (a) 30 ÷ 9
(b) 271 ÷ 5
(c) 3645 ÷ 42
(d) Eight people won £9875 on the lottery. How much did they each get ? (e) A piece of wood, 333 cm long, is sawn into 6 table legs. How long is each leg ?
Exercise 4 1.
Try to do all of the following questions mentally. Find :(a) 2·8 + 4·1
(b) 6·4 + 2·9
(c) 0·65 + 1·14
(d) 6·76 + 1·6
(e) 8·7 – 5·3
(f) 5·6 – 3·9
(g) 2·85 – 1·9
(h) 1·57 – 0·99
(i) Two shopping bags weigh 7·7 kilograms and 8·9 kilograms. What is the combined weight ? (j) A ship sails 34·8 kilometres of a 100 kilometre voyage. How far has the ship still to travel ? (k) A rally race Stage 1 : Stage 2 : Stage 3 :
consists of 3 stages 32·4 kilometres 28·7 kilometres 33·9 kilometres
What is the total race distance ? this is Chapter Three
In the number 32·78, what does the :(a) 3 stand for
3.
(b) 2 stand for
(b) 8·7
5·2 + 3·6
5
(b) 2·4
(c) 59·2
(d) 99·6.
(b) 2·7 + 3·15
(c) 15·6 – 3·4
(d) 0·76 – 0·09.
(c) 5·64 – 3·8
(d) 15·8 – 11·11.
Show all working and find :(a) 4·72 + 3·83
7.
4
Do the following mentally :(a)
6.
8·8
Round to the nearest whole number :(a) 3·8
5.
(d) 7 stand for ?
What decimal numbers are the arrows pointing to ? (a)
4.
(c) 8 stand for
(b) 18·7 + 2·78
Belinda pays £25·75 for petrol and £5·99 for a car wash. How much change will she get from two £20 notes ?
8.
James buys two CD’s at £8·95 each and three CD’s at £4·50 each. (a) How much will this cost him in total ? (b) How much change will he get from a £50 note ?
9.
Calculate the perimeter of each of the following shapes :(a)
