Presentation on theme: "Temperature, time, receipts and bills They're even in the pound!"— Presentation transcript:
1 Temperature, time, receipts and bills They're even in the pound! Decimals are my thingYou see them all aroundTemperature, time, receipts and billsThey're even in the pound!Can you think of any more examples?April Kindly contributed to the Adult Basic Skills Resource CentreTaz Kausar-Javaid, The Oldham College Kausar-Javaid, TasneemTeaching 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.TazMain curriculum linksN2/L1.5 Add, subtract, multiply and divide decimals up to two places.N2/L1.6 Multiply and divide decimals by 10 and 100.
3 PLACE VALUE 1 4 3 7 5 9 Hundreds 100s Tens 10s Units 1s . Tenths 10ths Hundredths100thsThousandths1000ths143759
4 MULTIPLYING BY 10, 100 ,1000x 10x100x 100022.022022002200016.5165165016500
5 DIVIDING BY 10, 100 ,1000÷ 10÷ 100÷ 100019500195019519.523423.42.340.234
6 ADDITION AND SUBTRACTION LINE UP DECIMAL POINTS EXACTLYADD OR SUBTRACT THE SUME.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 answer345x21Put 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 lineRound the answer to sensible number of figures where necessaryE.g ÷ 4Add 0s to the end if need beNote – 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, 1000Do exactly the same to the number you are dividingDivide to find the answer
10 continuedE.g ÷ 0.05Multiply the 0.05 by 100 to make it into a wholeNumber. Then do the same to 7.4.5Check 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)