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Significant Figures (Part 1)
1
...
2
...
(a) All non-zero digits in a number are significant figures (s
...
Example:
(i) 568 (3 s
...
)
(ii) 36
...
f
...
Example:
(i) 7001 (4 s
...
)
(ii) 3
...
f
...
054 (4 s
...
)
(c) All zeroes that lie on the right of a non- zero digit in a decimal are significant
...
70 (2 s
...
)
(ii) 4
...
f
...
00 (3 s
...
)
(d) Zeroes that lie on the left of a non-zero digit in a decimal are not significant
...
05 (1 s
...
)
(ii) 0
...
f
...
07040 (4 s
...
)
(e) Zeroes at the end of a whole number are to be considered as non significant unless stated
otherwise
...
f
...
f
...
f
...
(a) 246 = 246 (3 s
...
)
(b) 2463 = 2460 (3 s
...
)
(c) 24632 = 24600 (3 s
...
)
(d) 0
...
00745 (3 s
...
)
(e) 0
...
00745 (3 s
...
)
(f) 0
...
00746 (3 s
...
)
(g) 0
...
00740 (3 s
...
)
Example 2:
Round off each of the following numbers to the number of significant figures indicated in brackets
...
f
...
5089 (3 s
...
)
(c) 33
...
f
...
40055 (3 s
...
)
(e) 0
...
f
...
97 (3 s
...
)
Solution:
(a) 3500 (2 s
...
)
(b) 0
...
f
...
f
...
401 (3 s
...
)
(e) 0
...
f
...
0 (3 s
...
)