1. Adding Decimal Numbers
Whole
numbers
Keep decimal points in line
Line up whole numbers carefully
Fill up spaces with zeros .
12.6 . 4 .
0.24 .
100 . 1 1 6 8 4
add

2. Adding Decimal Numbers
Whole
numbers
Keep decimal points in line
Line up whole numbers carefully
Fill up spaces with zeros . . . . .
add

3. Subtracting Decimal Numbers
70.3 – 8.46
Whole
numbers
Keep decimal points in line
Line up whole numbers carefully
Fill up spaces with zeros
Borrow from next available number 1 2 69 .
70.3 1 . -
8.46 . 6 1 8 4
subtract

4. Subtracting Decimal Numbers
– 43.99
Whole
numbers
Keep decimal points in line
Line up whole numbers carefully
Fill up spaces with zeros
Borrow from next available number . . - .
subtract

5. Multiplying Decimal Numbers
32.46 x 4.3
32.46 x 4.3
3246 x 43
2 dp
1 dp 9 7 1 3 1 8
= 3dp 12 9 1 8 4 2
Ignore decimal points
Multiply
Count total decimal places in question
Put decimal point into answer 1 3 1 9 1 5 7 8 

6. Multiplying Decimal Numbers
4.2 x 1.3
Ignore decimal points
Multiply
Count total decimal places in question
Put decimal point into answer

7. Dividing Decimal Numbers.
9.28 ÷ 0.4 ÷ 2 3 2 . 1 4
9 2 8
dividend
divisor . .
9 2 8 4
Change divisor to a whole number by moving decimal point
Move decimal point in dividend same number of places
Set out division
keep decimal points in line

8. Dividing Decimal Numbers
31 ÷ 0.25
dividend
divisor
Change divisor to a whole number by moving decimal point
Move decimal point in dividend same number of places
Set out division
keep decimal points in line