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Multiply and divide any positive integer up to 10 000 by 10 or 100 and understand the effect. UNIT 1.

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Presentation on theme: "Multiply and divide any positive integer up to 10 000 by 10 or 100 and understand the effect. UNIT 1."— Presentation transcript:

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2 Multiply and divide any positive integer up to by 10 or 100 and understand the effect. UNIT 1

3 Multiply & Divide by 10, 100, 1000 Learning Intention 1. To understand how to multiply and divide decimal numbers by 10, 100, Success Criteria 1.Understand the simple rules to multiply and divide decimal numbers. 2.Be able do calculations. Level E Decimals DiscoveringTime Sunday, 30 August To understand the effect.

4 ten thousands thousandshundredstensunits The effect of multiplying a number by 10, 100, 1000 & x x x x x100 What is happening ? six sixty six hundred six thousand sixty thousand

5 Decimal points tenthsunits The effect of dividing a number by 10, 100, 1000 & What is happening ? thousandths hundredths 7 nought point seven nought point nought nought seven seven nought point nought seven Level E

6 thousands unitstenshundreds 246x10 Multiplying a whole number by 10 24x all digits move one place to the left Example add place holder zero to the units column 246 x 10 = 2460 = Level E

7 thousands unitstenshundreds Multiplying a decimal by x all digits move two places to the left Example add place holder zeros to the units columns x 100 = = x ten thousands 6 Level E Decimal point tenths 4

8 Multiply & Divide by 10, 100, 1000 Level E Decimals DiscoveringTimeSunday, 30 August 2009 To multiply a decimal number by 10, Simply move all digits 1 place to the left: e.g.2.55 x 10 = 25.5digits are moved 1 place to left To multiply a decimal number by 100, Simply move all digits 2 places to the left: e.g.1.02 x 100 = digits are moved 2 places to left

9 Multiply & Divide by 10, 100, 1000 Level E Decimals DiscoveringTime Sunday, 30 August 2009 To multiply a decimal number by 1000, Simply move all digits 3 places to the left: e.g x 1000 = digits are moved 3 places to left

10 thousands unitstenshundreds Multiplying a whole number by x all digits move two places to the left Example add place holder zeros to the units & tens columns 935 x 100 = = 935x100 ten thousands 9 Level E

11 thousands unitstenshundreds Multiplying a decimal by x all digits move two places to the left Example add place holder zeros to the units columns x 100 = = x ten thousands 4 Level E Decimal point tenths 7

12 unitstenshundreds Dividing a whole number by 10 8 all digits move one place to the right Example = = 78.6 Decimal point Level E

13 Decimal point hundredths tenths unitstenshundreds Dividing a whole number by all digits move two places to the right Example = = Level E

14 As the following numbers appear multiply them by As the numbers appear multiply by

15 Sunday, 30 August 2009 Level E Plenary

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