Problem 67P

Correct any answers that have the incorrect number of significant figures.

(a) (78.56 − 9.44) × 45.6 = 3152

(b) (8.9 × 105 ÷ 2.348 × 102) + 121 = 3.9 × 103

(c) (45.8 ÷ 3.2) − 12.3 = 2

(d) (4.5 × 103 − 1.53 × 103) ÷ 34.5 = 86

Solution 67P

Step 1:

When addition or subtraction is to be carried out in the numbers having different precisions, the final result should be reported up to the same number of decimal places as are present in the numbers having the least of decimal places.

For multiplication and addition the least number of significant figure in the number of problem determines the number of significant figure in the final answers.