Question

By rounding each number to 1 significant figure,

estimate the answers to:
a)763 x 42
_______
82

b)39 × 52
_______
3.8 x 4.9

Answer 1

see explanation

Explanation:

rounding each number to 1 significant figure

(a)

763 × 42

≈ 800 × 40

= 32000

(b)

39 × 52

≈ 40 × 50

= 2000

(c)

3.8 × 4.9

≈ 4 × 5

= 20