1. Significant Numbers Using Standard form Significant Numbers www.mathsrevision.com Int 2

2. Starter www.mathsrevision.com Int 2

3. Learning Intention Success Criteria 1.To know the meaning of significant number. 1.To understand the term significant numbers for decimals and whole numbers. 2.Apply knowledge to problems. www.mathsrevision.com Int 2 Significant Numbers

4. www.mathsrevision.com Int 2 Significant Numbers In mathematics a figure or digit is significant if it gives an idea of both: (i)Quantity (ii)Accuracy It is similar to rounding and all to do with zero’s

5. www.mathsrevision.com Int 2 Significant Numbers Decimal numbers 0.04 0.37 1 significant figures 2 significant figures What is the first rule? 0’s at the beginning DON’T count 1.04 0.306 3 significant figures 3 significant figures What is the second rule? 0’s in the middle DO count 1.30 0.90 3 significant figures 2 significant figures What is the third rule? 0’s a the end DO count

6. www.mathsrevision.com Int 2 Significant Numbers Easy rule :Just remember 0’s at the beginning DON’T count 1.24 2.307 1.2 2.3 0.445 0.0162 0.45 0.016 0.003398 0.0103290 0.0034 0.010 Exercise : Round to 2 sig figures 55.24 12.307 55 12 0.08445 0.00106 0.084 0.0011 0.030467 0.0503990 0.030 0.050

7. www.mathsrevision.com Int 2 Significant Numbers Whole Numbers 106 9087 3 significant figures 4 significant figures What is the rule 360 ? 2 / 3 significant figures 0’s in the middle DO count 0’s at the end MAY or MAY NOT count depending on the question. There are 360 degrees in a circle. 358 to the nearest ten is 360. 3 significant figures 2 significant figures

8. www.mathsrevision.com Int 2 Significant Numbers Easy rule :0’s at the end MAY or MAY NOT count 15030 230 15000 230 17693 135 18000 140 1378409 1155 1400000 1200 Exercise : Round to 2 sig figures 55 1094 55 1100 445 50298 450 50000 10000 314 10000 310

9. Now try MIA Ex 1 Ch16 (page 3) www.mathsrevision.com Int 2 Significant Numbers

10. Starter www.mathsrevision.com Int 2

11. Learning Intention Success Criteria 1.Convert between and normal form and scientific notation. 1.Work with a calculator to solve problems to specific significant figures. Also convert between normal form and scientific notation. 2.Use calculator to work problems to a specific significant figures. www.mathsrevision.com Int 2 Significant Numbers

12. www.mathsrevision.com Int 2 Significant Numbers Standard Form / Scientific Notation Normal mode 2001 1 ≤ a < 10 n = Integer Number 0.056 564.7 4 Sig. fig. 2 Sig. fig. 4 Sig. fig. Standard form always indicates the number of significant figures

13. Now try MIA Ex 2 Ch1 (page 5) www.mathsrevision.com Int 2 Significant Numbers