Transcript the ratio of a to be

What do you know about
ratios?
When have you seen or used
ratios?
What is a ratio?
How many different ways
can you write a ratio?
A ratio COMPARES two
quantities (numbers).
A ratio shows how much of
one thing you have compared
to something else.
a to b
a:b
a
b
All three are read as “the ratio of a to be”
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What is an equivalent ratio?
Create an example.
How many different ways
can you find equivalent
ratios for:
2 boys to 3 girls
How many different
strategies can we share?
 equivalent fractions
 multiplication
 tables
 tape diagram
The ratio of the length of
Shanni’s ribbon to the length
of Mel’s ribbon is 5 : 3 .
How much ribbon does Mel
use if Shanni uses 45m?
The ratio of the number of laps
Mason ran to the number of
laps Laney ran was 2 to 3.
If Mason ran 8 laps, how many
did Laney run?
The ratio of the number of laps
Mason ran to the number of
laps Laney ran was 2 to 3.
Use a table to list 4 more
equivalent ratios.
The ratio of the number of laps
Mason ran to the number of
laps Laney ran was 2 to 3.
Use a tape diagram to find how
far Mason ran if Laney ran
930m.
In a bag of mixed nuts, the ratio
of walnuts to cashews is 5 : 6.
Use a tape diagram to
determine how many walnuts
are in the bag if there are 54
cashews.
On a test, the ratio of the
number of problems Josie got
incorrect to the number of
problems she got correct is 2:9.
If Josie missed 8 problems, how
many did she get right?