Approximation - Edexcel

1

What is 1,856 rounded to the nearest 10?

2

What is 1,856 rounded to the nearest 100?

3

What is 3.141592653 rounded to 3 decimal places?

4

What is 3.141592653 rounded to 1 decimal place?

5

What is 467 rounded to one significant figure?

6

What is 0.53 rounded to one significant figure?

7

Estimate the value of 47 × 84?

8

Work out an estimate for (9 × 11) ÷ (2.57 + 2.09)?

9

The number 647 has been rounded to the nearest whole number. are the upper and lower bounds.

10

a = 30 (1 significant figure), b = 5 (nearest whole number). What is the upper bound of ab?