Decimal Numbers Worksheet Page 4
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1
2
3
4o
4
D ecim al N um bers - 3
E SO
• to decimal places (d.p.) :
4.16 = 4.2 to 1 decimal place
• to the nearest unit, ten, hundred, thousand,. . .
32 559 = 33 000 to the nearest thousand
• to significant figures (s.f.) : the first non-zero digit in a number is the 1st significant figure;
it has the highest value in the number. When rounding to significant figures, count from the
first non-zero digit.
For example:
54.76 ≈ 55 (to 2 s.f.)
0.00405 ≈ 0.0041 (to 2 s.f.)
6.339 ≈ 6.34 (to 3 s.f.)
Exercises - Set C
1.
Round these decimal numbers to the nearest whole number:
a)
5.8
b)
21.67
c)
39.175
2.
Round these numbers to the nearest thousand:
a)
2239
b)
12 563
c)
155 669
3.
Round these numbers to two decimal places:
a)
0.317
b)
15.304
c)
16.445
4.
Use a calculator to work these out. Write your answers correct to 3 s.f. where necessary:
16.84
a)
(16.8 + 12.4) · 17.1
b)
37.4
16.1 : (4.2
2.7)
c)
7.9 + 11.2
27.4
18.6
27.9
17.3
0.0768 + 7.1
d)
e)
+ 4.7
f)
3.2
16.1
8.6
18.69
3.824
D pto. M atemáticas. IES Jovellanos. 2011
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