Approximation and Estimation

Round off 0.005678 to 3 s.f.

• 0.01

• 0.00567

• 0.00568

• 0.005680

Round off 345980 to 3 s.f.

• 345

• 346

• 345000

• 346000

Round off 231.4567 to 3 s.f.

• 231.456

• 231.457

• 231

• 231.0000

Round off 0.09482 to 2 d.p

• 0.09

• 0.095

• 0.094

• 0.0948

Round off 1.0498 to 3 d.p

• 1.049

• 1.49

• 1.05

• 1.050

Add 589 and 1023, round off the answer to 3s.f.

• 161

• 1612

• 1610

• 1609

Subtract 6500 from 802300. Estimate the answer to 3 s.f.

• 795800

• 796

• 796000

• 7958

Estimate 11.5 - 0.76 by rounding off each number to 1 s.f.

• 10

• 11

• 9.2

Estimate 99.95  $\div$  5.045 by rounding off each number to 1 d.p.

• 19.8

• 20