Question 1: Estimate the product of 3.7 and 4.2 by rounding to the nearest whole number before multiplying.

Answer: 16

Question 2: Calculate an approximate value of 0.56 × 0.89 using estimation techniques.

Answer: 0.5

Question 3: Estimate the total cost if a shirt costing £12.99 is bought with a pair of trousers costing £23.45, rounding each to the nearest pound and then multiplying.

Answer: £36

Question 4: Estimate the product of 7.4 and 3.8 by rounding to one decimal place before multiplying.

Answer: 28.1

Question 5: Calculate an estimate for 1.05 × 0.99 by rounding each to 1.

Answer: 1

Question 6: A car travels approximately 132.8 km in a day. Estimate this distance to the nearest 50 km.

Answer: 150 km

Question 7: Estimate the product of 2.83 and 4.76 by rounding to two decimal places.

Answer: 13.5

Question 8: Estimate the total cost of 3 items costing £4.29, £5.87, and £6.45 by rounding each to the nearest pound and then adding.

Answer: £16

Question 9: Estimate the product of 9.6 and 2.3 by rounding each to the nearest whole number and then multiplying.

Answer: 22

Question 10: A factory produces approximately 157.3 units per day. Estimate this to the nearest 50 units.

Answer: 150 units

Question 11: Identify and correct the mistake in estimating: Estimating 5.49 × 3.78 as 5 × 4 = 20.

Answer: Incorrect, 5.49 rounds to 5.5 and 3.78 rounds to 3.8, so the estimate should be 5.5 × 3.8 = 20.9