2. Rounding- Decimal Places and Significant Figures

3. Rounding to 1 d.p 4. 8 3 2 5 5 or bigger ? 4.8 4. 8 4 2 5 5 or bigger ? 4.8 4. 8 5 2 5 5 or bigger ? 4.9 7. 0 6 2 5 5 or bigger ? 7.1 3. 4 7 2 5 5 or bigger ? 3.5 1. 2 9 2 5 5 or bigger ? 1.3 No Yes

4. Rounding to 2 d.p 5. 8 4 2 5 5 or bigger ? 5.84 1. 4 2 6 1 5 or bigger ? 1.43 0. 6 0 8 3 5 or bigger ? 0.61 0. 2 9 4 3 5 or bigger ? 0.29 0. 5 5 5 0 5 or bigger ? 0.56 0. 3 9 7 0 5 or bigger ? 0.40 No Yes No Yes

5. 4. 3 3 2 5 Significant Figures (Rounding) Numbers can be rounded to 1,2, 3 or more significant figures. We count the number of figures from the first non-zero digit. Rounding to 1 s.f 5 or bigger ? 4 5. 7 4 2 5 5 or bigger ? 6 0. 0 4 2 5 5 or bigger ? 0.04 NoYes No First non-zero digit.

6. Rounding to 1 s.f 0. 0 7 6 5 or bigger ? 0.08 0. 0 0 1 5 5 or bigger ? 0.002 Yes First non-zero digit. Significant Figures (Rounding)

7. 1. 4 7 2 9 5 or bigger ? 1.5 0. 0 5 3 5 5 or bigger ? 0.054 Yes First non-zero digit. Significant Figures (Rounding) Rounding to 2 s.f

8. Significant Figures (Rounding) When we approximate whole numbers we may need to insert zeros as required in order to maintain the size of the number Rounding whole numbers to 1 s.f 2 4 1 5 or bigger ? 200 No 5 8 7 5 or bigger ? 600 Yes 7 5 5 or bigger ? 80 Yes

9. Significant Figures (Rounding) When we approximate whole numbers we may need to insert zeros as required in order to maintain the size of the number Rounding whole numbers to 2 s.f 1 4 7 2 5 or bigger ? 1 500 Yes 4 2 7 2 8 5 or bigger ? 43 000 Yes 2 0 4 4 7 8 5 or bigger ? 200 000 No