©MathsWatch
Clip 90
Grade 3 questions
1)
2)
3)
Rounding to Significant Figures
Round the following numbers
to 1 significant figure:
5)
a)
428
a)
0.00618
b)
783
b)
0.00482
c)
5608
c)
0.00006492
d)
3 521
d)
0.004981
e)
21 999
f)
793 041
6)
Round the following numbers
to 2 significant figures:
Round the following numbers
to 2 significant figures:
a)
0.035812
b)
0.00082477
a)
846
c)
0.0038611
b)
2 647
d)
0.000037211
c)
3 552
d)
46 817
e)
89 711
f)
195 084
7)
Round the following numbers
to 3 significant figures:
a)
91 249
b)
64 182
c)
223 058
d)
389 512
e)
7 761 223
f)
4 997 124
8)
9)
4)
Round the following numbers
to 1 significant figure:
Work out the following and give your
answer to 3 significant figures:
a)
216 × 348
b)
7721 × 609
c)
8714 × 2198
Round the following numbers
to 3 significant figures:
a)
0.00143229
b)
0.000721981
c)
0.0000044251
d)
0.000668821
Round the following numbers
to 3 significant figures:
a)
47.84122
b)
9.778112
c)
12.35913
Work out the following and give your
answer to 3 significant figures:
a)
15 ÷ 0.38
b)
0.31 ÷ 0.16
c)
208 × 366
Page 90
©MathsWatch
Clip 90
Rounding to Significant Figures
Grade 3 answers
1)
2)
3)
Round the following numbers
to 1 significant figure:
5)
400
a)
428
b)
783 800
c)
5608
d)
3 521 4000
e)
21 999 20000
f)
793 041 800000
6000
6)
Round the following numbers
to 2 significant figures:
a)
0.00618 0.006
b)
0.00482
c)
0.00006492
d)
0.004981
0.005
0.00006
0.005
Round the following numbers
to 2 significant figures:
a)
0.035812 0.036
b)
0.00082477 0.00082
0.0039
a)
846 850
c)
0.0038611
b)
2 647 2600
d)
0.000037211 0.000037
c)
3 552 3600
d)
46 817
47000
e)
89 711
90000
f)
195 084
7)
200000
Round the following numbers
to 3 significant figures:
a)
91 249 91200
b)
64 182
c)
223 058
d)
389 512 390000
e)
7 761 223
f)
4 997 124
64200
8)
223000
7760000
5000000
9)
4)
Round the following numbers
to 1 significant figure:
Work out the following and give your
answer to 3 significant figures:
a)
216 × 348 75200
b)
7721 × 609 4700000
c)
8714 × 2198
19200000
Round the following numbers
to 3 significant figures:
a)
0.00143229 0.00143
b)
0.000721981 0.000722
c)
0.0000044251 0.00000443
d)
0.000668821 0.000669
Round the following numbers
to 3 significant figures:
47.8
a)
47.84122
b)
9.778112 9.78
c)
12.35913 12.4
Work out the following and give your
answer to 3 significant figures:
39.5
a)
15 ÷ 0.38
b)
0.31 ÷ 0.16
1.94
c)
208 × 366
76100
Page 90