Question

Estimate the result by rounding the numbers to the second decimal before performing the operation. Then also round your answer to the second decimal.

a) 2.3 x 0.12

b) 8123 x 0.211

c) 30.15 x 0.05

d) 3.15 x 0.0318

Answer 1

a) 0.28

b) 1705.83

c) 1.51

d) 0.09

Explanation:

a) 2.3 x 0.12

0.276

0.28

b) 8123 x 0.211

8123 × 0.21

1705.83

c) 30.15 x 0.05

1.5075

1.51

d) 3.15 x 0.0318

3.15 × 0.03

0.0945

0.09