1. Temperature, time, receipts and bills They're even in the pound!
Decimals are my thing
You see them all around
Temperature, time, receipts and bills
They're even in the pound!
Can you think of any more examples?
April Kindly contributed to the Adult Basic Skills Resource Centre
Taz Kausar-Javaid, The Oldham College Kausar-Javaid, Tasneem
Teaching notes: on slide 2 - I usually ask the students to think of examples of where they see the decimal in practice – i.e. petrol prices, fat content on food labels, etc. This can be done as a paired activity - the groups then feedback their ideas and these are inputted on slide 2 whether it is done as a PowerPoint or OHT presentation.
Taz
Main curriculum links
N2/L1.5 Add, subtract, multiply and divide decimals up to two places.
N2/L1.6 Multiply and divide decimals by 10 and 100.

2. DECIMALS
DECIMALS

3. PLACE VALUE 1 4 3 7 5 9 Hundreds 100s Tens 10s Units 1s . Tenths 10ths
Hundredths
100ths
Thousandths
1000ths 1 4 3 7 5 9

4. MULTIPLYING BY 10, 100 ,1000
x 10
x100
x 1000
22.0
220
2200
22000
16.5
165
1650
16500

5. DIVIDING BY 10, 100 ,1000
÷ 10
÷ 100
÷ 1000
19500
1950
195
19.5
234
23.4
2.34
0.234

6. ADDITION AND SUBTRACTION
LINE UP DECIMAL POINTS EXACTLY
ADD OR SUBTRACT THE SUM
E.g and 234 – 3.56

7. MULTIPLICATION 3.45 x 2.1 Ignore the decimal points Multiply as normal
Put the decimal point back into the answer
345
x21
Put the decimal point back into the answer. Look at the question, there are 3 numbers after the decimal place so work the decimal place back into the answer.

8. Division To divide a whole number into a decimal Divide as normal
Keep the decimal points in line
Round the answer to sensible number of figures where necessary
E.g ÷ 4
Add 0s to the end if need be
Note – check by multiplication

9. Divide a decimal by a decimal
Change the number you are dividing by into a whole number.
Do this by multiplying by 10, 100, 1000
Do exactly the same to the number you are dividing
Divide to find the answer

10. continued
E.g ÷ 0.05
Multiply the 0.05 by 100 to make it into a whole
Number. Then do the same to 7.4. 5
Check by multiplication – 148 x 0.05 = 7.4

11. continued Find 31.52 ÷2.4 Multiply 2.4 x 10 = 24 =
So we round to (to 2 dp)