Question #42446

1 Answer
Sep 21, 2015

a) 4.0xx10^24.0×102
b) 14.87xx10^(-9)14.87×109
c) 53.099153.0991

Explanation:

a) 1200.0/3.0 = 4.0xx10^21200.03.0=4.0×102
2 significant figures since 3.03.0 is 2 significant figures only.

b) 8.75xx10^(-9) + 6.1157xx10^(-9) = 14.87xx10^(-9)8.75×109+6.1157×109=14.87×109
2 decimal places since 8.758.75 contains two only.

c) 178.90456 - 125.8055=53.0991178.90456125.8055=53.0991
4 decimal places since 125.8055125.8055 contains four only.

You can refer to the following rule:
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Source: My teacher notes .