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Adding/Subtracting Decimals

Adding/Subtracting Decimals. Steps to success. Remember the snowman. Line up decimal points. Add/subtract as normal. Put decimal point in answer. . 3.2. +. 12.4. 15 6. The Test of Success. What is to be learned?. Steps to success Line up decimal points Add/Subtract as normal

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Adding/Subtracting Decimals

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  1. Adding/Subtracting Decimals Steps to success Remember the snowman Line up decimal points Add/subtract as normal Put decimal point in answer . 3.2 + 12.4 15 6

  2. The Test of Success What is to be learned? Steps to success Line up decimal points Add/Subtract as normal Put Decimal Point in Answer How to add/subtract decimals 4.35 + 17 .0 . 4.35 + 17.0 21 35

  3. Multiplying/Dividing Decimals Steps to success Don’t forget Me! Multiply/Divide as Normal Put decimal point in answer Check decimal points are in a line . 3.4 X 2 6 8

  4. Multiplying Decimals by 10,100 Steps to success X10 move point one place to right X100 multiply by 10 twice 5.83 X 10 3.7 X 100 3.7 X 10 = 37 = 58.3 X 10 = 370

  5. The Test of Success What is to be learned? Steps to success X10 move point one place to right X100 multiply by 10 twice How to multiply decimals by 10 and 100 5.6 X 10 = 56 (or 56.0) 3.7 X 100 = 370

  6. Dividing Decimals by 10,100 Steps to success ÷ 10 move point one place to left (put .0 if necessary) ÷ 100 divide by 10 twice 62 ÷ 10 45.83 ÷ 100 45.83 ÷ 10 = 4.583 .0 = 6.2 (or 6.20) ÷ 10 = .4583 0

  7. The Test of Success What is to be learned? Steps to success ÷10 move point one place to left (put .0 if necessary) ÷100 divide by 10 twice How to divide decimals by 10 and 100 8 ÷ 10 = 0.8 2.6 ÷ 100 = 0.026

  8. Interest Calculation Steps to Success Calculate Interest Add to original amount £840 in Bank Interest Rate2%p.a. 2% of 840 840 + 16.80 = £856.80 = 0.02 X 840 = £16.80

  9. Cost of a Loan Steps to Success Calculate no. of Payments Calculate cost of Payments Subtract amount loaned £2000 loan Over 2years Payments £104 No. of Payments 2 X 12 = 24 Cost of Payments 24 X 104 = 2496 Cost of Loan 2496 – 2000 = £496

  10. Hire Purchase Steps to Success Calculate Cost of Deposit Calculate cost of Payments H.P. Cost = Payments plus deposit £1800 cost Deposit 15%12 Payments of £144 Deposit 0.15 X 1800 = 270 Cost of Payments 12 X 144 = 1728 Cost of H.P. 1728 + 270= £1998

  11. Foreign Exchange – Changing Pounds Steps to Success Choose correct Exchange Rate Multiply by Exchange Rate CurrencyExchange RateUS Dollars 1.67 Euro 1.22 Change £250 into Euros 250 X 1.22 = €305

  12. Foreign Exchange – Changing Back Steps to Success Choose correct Exchange Rate Divide by Exchange Rate (Round to 2 d.p.) CurrencyExchange RateUS Dollars 1.62 Euro 1.24 Change $20 into pounds 20 ÷1.62 = £12.35

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