Significant Numbers www mathsrevision com Int 2 Significant

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

www. mathsrevision. com Starter Int 2

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

Significant Numbers www. mathsrevision. com Int 2 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

Significant Numbers www. mathsrevision. com Int 2 Decimal numbers 0. 04 1 significant figures 0. 37 2 significant figures 1. 04 3 significant figures 0. 306 3 significant figures 1. 30 3 significant figures 0. 90 2 significant figures What is the first 0’s at the beginning DON’T count rule? What is the second rule? 0’s in the middle DO count What is the third 0’s a the end DO count rule?

Significant Numbers Int 2 www. mathsrevision. com Easy rule : Just remember 0’s at the beginning DON’T count Exercise : Round to 2 sig figures 1. 24 1. 2 55. 24 55 2. 307 2. 3 12. 307 12 0. 445 0. 08445 0. 084 0. 0162 0. 016 0. 00106 0. 0011 0. 003398 0. 0034 0. 030467 0. 030 0. 0103290 0. 010 0. 0503990 0. 050

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

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

Significant Numbers www. mathsrevision. com Int 2 Now try MIA Ex 1 Ch 16 (page 3)

www. mathsrevision. com Starter Int 2

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

Significant Numbers Int 2 www. mathsrevision. com Standard Form / Scientific Notation Normal mode 1 ≤ a < 10 n = Integer Number Standard form 4 Sig. fig. 2001 2 Sig. fig. 0. 056 4 Sig. fig. 564. 7 always indicates the number of significant figures

Significant Numbers www. mathsrevision. com Int 2 Now try MIA Ex 2 Ch 1 (page 5)