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Unformatted text preview: 13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. Working with Decimals Decimal Scales Decimal Numbers Decimal Numbers www.mathsrevision.com Multiplying and Dividing by 10, 100, 1000 Multiplying and Dividing by a single Digit Rounding to 1 Decimal Place Addition and Subtraction MNU 203b MNU 204a 13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. Starter Questions Starter Questions www.mathsrevision.com 1. F in d t h e m is s in g v a lu e 2 . C a lc u la t e o f 6 0 0 0 3 . W h a t is t h e n e x t t h r e e n u m b e r s in t h e s e q u e n c e 9 , 15 , 2 1, 2 7 , ...., ...., .... 4 . R o u n d 7 2 t o t h e n e a r e s t 10 3 ? = 4 2 0 2 0 % MNU 203b MNU 204a 13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. www.mathsrevision.com Learning Intention Learning Intention Success Criteria Success Criteria 1. 1. Understand what a decimal number is. Understand what a decimal number is. 1. To explain what a decimal number is. Write down the decimal number represented by a fraction diagram. Decimal Numbers Decimal Numbers 2. 2. Write down the decimal number Write down the decimal number represented by a fraction diagram. represented by a fraction diagram. Writing Decimals MNU 203b MNU 204a 13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. www.mathsrevision.com Decimal Numbers Decimal Numbers When you take a When you take a single unit single unit and divide it and divide it into 10 bits into 10 bits , , what we then have are what we then have are decimal fractions decimal fractions of a whole number of a whole number Writing Decimals Imagine, 1 bar of chocolate as our UNIT of measure. 1 (of 1 b ar ) 10 or 0.1 1 0 .1 10 1. 0 0.1 0.4 0.2 0.3 0.5 0.6 0.9 0.7 0.8 1.0 means ten MNU 203b MNU 204a 13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. www.mathsrevision.com Decimal Numbers Decimal Numbers Writing Decimals Example : Write down the decimal number represented by the shaded area. (a) (b) 0 .3 3 " wh ic h m e ans 3 t e nt h s = " 10 0 .5 5 1 " whic h m e ans 5 t e nt hs = = " 10 2 MNU 203b MNU 204a 13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept....
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 Spring '11
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