Adding and Subtracting Decimals

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Rules for adding or subtracting decimals:

(1) Line up the numbers by the decimal point.

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Rules for adding or subtracting decimals:

(2) Annex zeros to make the same number of places behind the decimal point in all numbers in the problem.

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Rules for adding or subtracting decimals:

(3) Add or subtract beginning on the far right side of the problem.

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Rules for adding or subtracting decimals:

(4) Place the decimal point in the answer by bringing the decimal point straight down from the problem to the answer. Next Slide

Examples:

48.6

27.35

+ 12.394

00

0

44

1

3

1

8

1

8 .Next Slide

Examples:

67.5

- 32.67

0

3

10

8

4

4

6

3 .

14

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Now it is your turnType your name and send:

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NumeracyNumeracy

Money ProblemsMoney Problems

At theAt the

CafeCafe

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MenuFour of us went to eat and we had:Soup of the day £1.50

Hot dog £1.20

French fries 80p

Pizza 50p per slice

How much change did we have from £10?

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A Coffee 60p

C Hot Chocolate 80p

E Fizzy Pop 50p

B Tea 70p

D Milkshake 90p

F Milk 40p

Drinks MenuThree of us had drinks and we were given £0.30 change from £2. Which three drinks did we have?

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Ice Cream £1.80

Gingerbread People 60p

Cherry Pie £1.50

Jelly 90p

Doughnuts

25p each

Fresh fruit £1.00

Dessert Menu

We ate every one of these puddings. How much change did we get from £20?

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I really understand this and I got most of them correct.

I am beginning to understand this and I got many of them correct.

I need more practice to help me understand this and I made lots of mistakes.A

B

C

LO: To subtract using decimals

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