Estimating Calculations

Question 1

Round each number to 1 sig fig ( e.g nearest whole number)

BIDMAS

3.1 X 9.87 / 0.509

Answer 1

3 X 10 / 1

= 30

Question 2

89.3 X 0.51 / 4.8

Answer 2

90 X 1 / 5

90 / 5

= 18

Question 3

? 4.98 + 2.16 X 7.35

?= square root

Answer 3

? 5 + 2 x 7
7x7 = 49
?49
= 7