Upper and lower bounds

12 questions

1. In the number 56 392 the 3 is the third ___ figure.
2. Choose the correct calculation to estimate the cost of hiring an electrician for 4.5 hours, where the total cost = £42.50 × number of hours + £25
3. Estimate the value of {435.8\times8.742\over3.04}
4. Will the estimation of 128.03 + 0.512 be an overestimate or underestimate?
5. Estimate the amount of change received from £500 when purchasing a TV costing £375
6. Estimate the circumference of a circle with a radius of 8.4 cm.
7. Upper and lower bounds are used when a number has been ___.
8. Work out the lower and upper bounds of 320 rounded to the nearest 10
9. Work out the lower and upper bounds of 12.6 rounded to 1 decimal place.
10. ___ rounded to the nearest integer. The lower bound is 147.5 and the upper bound is 148.5
11. ___ rounded to 1 decimal place. The lower bound is 10.25 and the upper bound is 10.35
12. ___ rounded to 2 significant figures. The lower bound is 8750 and the upper bound is 8850

License: OGL