Adding/Subtracting Decimals

Steps to success Line up decimal points

Add/subtract as normal

Put decimal point in answer

3.212.4+

15 6

.

Remember the snowman

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 + 17.04.35

+ 17.0 21 35

.

Multiplying/Dividing Decimals

Steps to success Multiply/Divide as Normal

Put decimal point in answer

Check decimal points are in a line

3.4 2X

6 8

.

Don’t forget Me!

Multiplying Decimals by 10,100

Steps to success X10move point one place to right X100multiply by 10 twice

5.83 X 10 3.7 X 1003.7 X 10 = 37

= 58.3

X 10 = 370

The Test of Success

What is to be learned? Steps to success X10move point one place to right X100multiply by 10 twice

How to multiply decimals by 10 and 100

5.6 X 10 = 56 (or 56.0)3.7 X 100 = 370

Dividing Decimals by 10,100

Steps to success ÷ 10move point one place to left(put .0 if necessary)÷ 100divide by 10 twice

62 ÷ 1045.83 ÷ 10045.83 ÷ 10 = 4.583

= 6.2 (or 6.20)

÷ 10 = .4583

.0

0

The Test of Success

What is to be learned? Steps to success ÷10move point one place to left(put .0 if necessary)÷100divide by 10 twice

How to divide decimals by 10 and 100

8 ÷ 10 = 0.82.6 ÷ 100 = 0.026

Steps to SuccessCalculate InterestAdd to original amount

Interest Calculation

£840 in Bank Interest Rate 2% p.a. 2% of 840= 0.02 X 840 = £16.80

840 + 16.80= £856.80

Steps to SuccessCalculate no. of PaymentsCalculate cost of PaymentsSubtract amount loaned

Cost of a Loan

£2000 loan Over 2 years Payments £104No. of Payments 2 X 12 = 24Cost of Payments 24 X 104 = 2496Cost of Loan 2496 – 2000 = £496

Steps to SuccessCalculate Cost of DepositCalculate cost of PaymentsH.P. Cost = Payments plus deposit

Hire Purchase

£1800 cost Deposit 15% 12 Payments of £144Deposit 0.15 X 1800 = 270Cost of Payments 12 X 144 = 1728Cost of H.P. 1728 + 270 = £1998

Steps to SuccessChoose correct Exchange RateMultiply by Exchange Rate

Foreign Exchange – Changing Pounds

Currency Exchange Rate US Dollars 1.67 Euro 1.22

Change £250 into Euros250 X 1.22 = €305

Steps to SuccessChoose correct Exchange RateDivide by Exchange Rate

Foreign Exchange – Changing Back

Currency Exchange Rate US Dollars 1.62 Euro 1.24

Change $20 into pounds20 ÷ 1.62

(Round to 2 d.p.)

= £12.35