Dividing decimals by whole numbers – Context of money Rounding decimal numbers- Context of Money.
When we divide money we are dividing decimals. If we share £5.16 by 3, Example: 1 3 ) £5.16 1 3 ) £5.216 1. 7 3 ) £5.216 1. 72 3 ) £5.216
You carry the remainder 2 onto the next number as usual. When you meet the decimal point in the sum, put it up in your answer. Now carry on dividing 3 into 21 Finish off the sum and you have the answer. Does it look about right?
Have a go at dividing these sums of money. 1)
6 ) £8.40
2)
7 ) £2.24
3)
2 ) £39.84
4)
8 ) £16.56
1) 2) 3) 4)
£1.40 £0.32 £19.92 £2.07
Sometimes you might get to the end of the sum and still have a number to carry (a remainder). For example: 1 4 ) 6.22
Start as normal
1. 5 4 ) 6.22
We divide 22 by 4, but still have a remainder of 2
1. 5 5 4 ) 6.2220
Add a 0 on the end and carry on as usual, until finished.
You can carry on adding 0’s for as long as you want, but usually it makes sense to ROUND OFF after 2 or 3 decimal places.
Decimal places are the numbers after the decimal point 2.3 2.35 2.358 2.3589
has 1 decimal place has 2 decimal places has 3 decimal places has 4 decimal places
Sometimes, when you have a lot of decimal numbers you have to ROUND OFF 0
1
2
3
4 or below KEEP THE SAME
4
5
6
7
5 or above ROUND UP
8
9
We will start by rounding up money. These amounts need to be rounded off to pounds and pence. This means you do not need the 3rd decimal place … you need to round it off. £1.759 the number after the pence is a 9 - so round up to
£1.76
£1.752 the number after the pence is a 2 - so keep it at
£1.75
£11.574 the number after the pence is a 4 - so keep it at
£11.57
£11.575 the number after the pence is a 5 - so round it up to
£11.58
Remember!
B
Have a go at these yourself:
1)
£1.347
the number after the pence is a 7 - so round up to_ ______
2)
£1.463
the number after the pence is a 3 - so keep it at _ _______
3)
£36.501 keep it at
_______
4)
£78.185 round up to
_______
5)
£3.988
6)
£4.674
Rounding Money 1) £1.35 2) £1.46 3) £36.50 4) £78.19 5) £3.99 1) £4.67
Well done for completing the Dividing Decimals PowerPoint. If you require help do not hesitate to contact you Functional Skills Maths Tutor