Post on 18-Jan-2016
Ratios and rates
Ratio
Rate
Scale
Scale Drawing
Fraction
Equivalent
Solve
Problem
Receive
Distance
Floor plan
This topic has 11 key words:
Ratio
Definition: A ratio compares numbers in a set order.
Example: The ratio of men to women in the green box is 3:1.
The ratio of women to
men in the green box
is 1:3.
Rate
Definition: Rates compare things that are measured differently.
Example: A woman walks 5km (distance) in 1 hour (time).
This is written 5km / h.
Scale
Definition: Scale is a ratio of the size of something compared to the size of something else.
Example: This toy car is 4cm long. The real car is 400cm long. The scale is 4:400.
This is the same as
1:100.
Scale DrawingDefinition: A drawing where all parts are a certain amount smaller than the real thing.
Example: In this drawing of a horse, all parts of the drawing are 10 times smaller than the real horse.
Fraction
Definition: A part of a whole.
Example: The whole pizza below has 4 slices.
Someone has taken 1 slice.
Three slices are left on the plate.
The fraction of the whole pizza
that is on the plate is ¾.
Equivalent
Definition: The same as something else.
Example: The ratio of circle A that is shaded is 1:2. The ratio of circle B that is shaded is 2:4.
1:2 is equivalent to 2:4.
Circle A Circle B
Solve
Definition: To find out something new.
Example: Solve the equation to find y.
2 + y = 3.
-2 -2
y = 1
We solved this equation and found that y = 1.
Problem
Definition: Something that we need to find an answer for.
Example: 2 cans of coke cost $2. How much does one can of coke cost?
This is a problem. Can you find the answer?
$2 ?
Receive
Definition: To get something.
Example: Bob will receive $100 for the work he is doing in the garden.
Distance
Definition: How far it is from one point to another.
Example: The distance
from Sydney to Brisbane
is about 1000km.
Floor Plan
Definition: A drawing of a building of the floor of a building which is done to scale.
Example: This floor plan shows a house with three bedrooms.