Science, Maths & Technology
Squares, roots and powers
...simple approximation, say 1 foot 30 cm = 0.3 m. Then 1 foot cubed (0.3)3 = 0.027 m3. More accurately, 1 foot = 30.48 cm = 0.3048 m. So 1 foot cubed = (0.3048)3 = 0.028 m3 to three d.p. Activity 13 Without using your calculator, find the following, as estimates for the calculator work in Question 7. (a) 92 (b) 43 (c) (d) (e) (−3)2 Answer (a) 92 = 9 × 9 = 81 (b) 43 = 4...