Download - Adding/Subtracting Decimals
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