Transcript Ratio (PowerPoint) -

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© B. Taylor - 2004
Ratios compare quantities
They are usually written
in their simplest form.
eg:
Simplify the ratio 4 : 10
answer:
2 is the biggest
number which goes
into both of these
numbers
Divide each number in the
ratio by 2, to give:
2 : 5
Ratios compare quantities
They are usually written
in their simplest form.
eg:
Simplify the ratio 10 : 25
answer:
5 is the biggest
number which goes
into both of these
numbers
Divide each number in the
ratio by 5, to give:
2 : 5
Ratios compare quantities
They are usually written
in their simplest form.
eg:
Simplify the ratio 15 : 21
answer:
3 is the biggest
number which goes
into both of these
numbers
Divide each number in the
ratio by 3, to give:
5 : 7
Ratios compare quantities
They are usually written
in their simplest form.
eg:
Simplify the ratio 8 : 18
answer:
2 is the biggest
number which goes
into both of these
numbers
Divide each number in the
ratio by 2, to give:
4 : 9
Ratios compare quantities
They are usually written
in their simplest form.
eg:
Simplify the ratio 35 : 56
answer:
7 is the biggest
number which goes
into both of these
numbers
Divide each number in the
ratio by 7, to give:
5 : 8
To make comparisons,
we can write ratios
in the form 1 : n.
eg:
Write the ratio 4 : 10
in the form 1 : n
answer:
We divide both
numbers in the
ratio by the
first number
Divide each number in the
ratio by 4, to give:
1 : 2.5
To make comparisons,
we can write ratios
in the form 1 : n.
eg:
Write the ratio 3 : 21
in the form 1 : n
answer:
We divide both
numbers in the
ratio by the
first number
Divide each number in the
ratio by 3, to give:
1 : 7
To make comparisons,
we can write ratios
in the form 1 : n.
eg:
Write the ratio 8 : 34
in the form 1 : n
answer:
We divide both
numbers in the
ratio by the
first number
Divide each number in the
ratio by 8, to give:
1 : 4.25
To make comparisons,
we can also write ratios
in the form n : 1.
eg:
Write the ratio 4 : 10
in the form n : 1
answer:
We divide both
numbers in the
ratio by the
second number
Divide each number in the
ratio by 10, to give:
0.4 : 1
To make comparisons,
we can also write ratios
in the form n : 1.
eg:
Write the ratio 8 : 32
in the form n : 1
answer:
We divide both
numbers in the
ratio by the
second number
Divide each number in the
ratio by 32, to give:
0.25 : 1