Rules in Rounding Off Numbers
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Transcript of Rules in Rounding Off Numbers
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8/8/2019 Rules in Rounding Off Numbers
1/7
If the number following the digits to be kept for
the answer is less than 5, the digits kept are not
altered.
Examples
4.073 Round off to three digits 4.07
54.37 Round off to two digits 54
10578 Round off to oneSignificant digit 10000
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8/8/2019 Rules in Rounding Off Numbers
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If the number following the digits to be kept for
the answer is 5 or greater, add 1 to the digitkept.
Examples
4.073 Round off to two digits 4.1
54.57 Round off to two digits 55
10578Round off to three
Significant digit 10600
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8/8/2019 Rules in Rounding Off Numbers
3/7
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8/8/2019 Rules in Rounding Off Numbers
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In multiplying or dividing significant figures, the
answer should not have more significant figures
than the measurement having the fewest
significant figures.
1009.79 km 53.44 L
Examples
6 SF 4 SF
18.89577 km/L
18.90 km/L
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8/8/2019 Rules in Rounding Off Numbers
5/7
76.02 cm x 4.45 cm x 0.190cm
4 SF 3 SF
62.83053 cm
3
62.8 cm33 SF
1) 20.60 m x 3.71m
2) 43 g 454 L
3) 2.1 m (25.3 m/4 m)
1) 20.60 m x 3.71m 76.426 m2 76.4 m2
2) 43 g 454 L 0.0947137g/L
0.095 g/L
3) 2.1 m (25.3 m/4 m) 13.2825 m 10 m
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8/8/2019 Rules in Rounding Off Numbers
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In adding or subtracting significant figures, the
answer should not have more decimal places
than the least accurate.
Examples
13.6 g
+ 4.082 g17.682 g
1 decimal place
3 decimal places
17.7 g
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8/8/2019 Rules in Rounding Off Numbers
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64.41 g
- 52.8 g
12.61 g
2 decimal places
1 decimal place
12.6 g
1)1.78m + 40.1m
2)6.211m + 165.0 m + 3.4 m
3) 10.55 cm + 231 cm
4) 365.54
6km 1.8953
6km
41.9 m
174.6 m
242 cm
363.651 km