The bottom number tells us how many parts in the whole pizza.. You can see examples of decimal numbers being used everytime you walk down the High Street.. B contains a decimal point, m
Trang 1Fractions & Decimals
Trang 2This pizza has been cut into three equal parts. We call these thirds. A third is written as 1
3
Trang 3parts gives us three thirds. Think about just one slice. We can write this using a fraction
Trang 4Think about two slices. Two slices is two thirds. We can write two thirds as
Trang 5The top number of the fraction tells us how many slices we have.
We call it the numerator.
The bottom number tells us how many
parts in the whole pizza.
We call it the denominator.
2 3
Trang 6What if you have a cake cut into six equal parts?
Here are all the fractions you can make.
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Trang 9You can see examples of decimal numbers being used
everytime you walk down the High Street. For example
banks use them when quoting the current rate of interest
or currency exchange rates
Each of these three numbers below has the same three digits, in the same order, yet they are all different. Take a good look at them
625 62.5 6.25
Trang 10A B C
A is a whole number, and would be read as six hundred and twenty five
B contains a decimal point, marking the end of the whole number, and would be read as sixtytwo point five
C also contains a decimal point, and would be read as six point two five (not six point twenty five)
The next in the series would be written 0.625. It contains no whole number, and it is usual to begin with a zero before the decimal point
in this case. It would be read as zero point six two five
Trang 11The decimal point marks the end of the whole numbers.
Digits on the left of the point are whole numbers
Digits on the right of the point are decimal fractions (fractions of a whole number).
Where there is no whole number, begin with a zero in the units position.
Digits after the decimal point are usually read individually.
Writing numbers
Twentyseven point five is written 27.5
Nine point zero six is written 9.06
One hundred and one point zero zero two is written 101.002
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