By rounding each number to 1 Significant figure, estimate the answers to:
a) 763 x 42/ 82?
Answers
Given : 763 x 42/ 82
To Find : By rounding each number to 1 Significant figure, estimate the answer
Solution:
significant
All non zero digits are significant
The leftmost nonzero digit is the first or most significant figure. 1
If there is a decimal point, the rightmost digit (including 0 ) is the last or least significant figure 2
All digits between the most significant figure and the least significant figure are significant. 3.06
763 rounded to 1 significant figure = 800
42 rounded to 1 significant figure = 40
82 rounded to 1 significant figure = 80
763 * 42 / 82
= 800 * 40 / 80
= 10 * 40
= 400
Hence 400 is the correct answer
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