Which calculation would we do to estimate the answer to 467 ÷ 0.48?

3. Estimate the answer to 273 ÷ (0.64 + 0.853)

Which of the following calculations would have as estimated answer of 1000?

5. Would the estimate for 743 x 3299 be an overestimate or an underestimate?

Key Stage 4

Estimating answers

What is the upper bound of 21 cm rounded to the nearest centimetre?

The population of Yorkshire is 5 400 000 to two significant figures, what is the greatest possible number of people who live in Yorkshire?

What is the lower bound for 120, rounded to the nearest 5?

A rectangle has sides of 5.6 cm and 8.4 cm rounded to the nearest millimetre. What is the lower bound for the perimeter?

The side length of a square is rounded to the nearest tenth of a centimetre and used to calculate its area  of 38.44 cm². What is the lower bound for the perimeter of the square?

Estimating answers

Lesson outcome