Direct proportion

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Direct ProDirect Propportion.ortion.
100o
O
A B
5cm
L
T
o
D 0 3 6 10 20
E 24

Direct ProDirect Propportion All Around.ortion All Around.
Direct proportion applies to all of the situations below:
In ea...

The FindinThe Findingg One Method.One Method.
Example 1.
If it costs 85p for 5 Mars bars, what is the cost of 3 Mars bars ...

Example 2.
If you are paid £261 for 18 hours work, how much will you be
paid for 23 hours work ?
Solution.
Find the pay fo...

Example 3.
It takes a production line 90 hours to make 120 cars. How long does
it take to make 330 cars ?
Solution.
Calcul...

What Goes In The Box ?What Goes In The Box ?
Calculate the following:
(1) It costs £21.06 for a hotel to buy 27 boxes of c...

The Cross-MultiThe Cross-Multipplication Method .lication Method .
This method is a more sophisticated way of solving dire...

Key Point.
Whenever you have two quantities and when one is doubled or trebled
etc the other quantity doubles or trebles e...

Example 1.
If you are paid £ 190.21 for 23 hours work, then what is your pay
for 17 hours work ?
Solution. Identify the tw...

Example 2.
If 5 hectares of wheat take 12 hours to harvest, how long will 27
hectares take ?
Identify the two quantities b...

Example 3.
Find the area
of the sector
OAB of this
circle if angle
AOB is 100o
Solution.
100o
O
A B
5cm
Find the area of t...

Example 3.
172o
O
A
B12cm
Calculate the arc
length AB on this
circle.
Solution.
Find the circumference of the circle.
C = ...

What Goes In The Box ? 2What Goes In The Box ? 2
(1) The shadow of a tree 7.4m high is 10.6m . How long will the
shadow of...

GraGrapphs Of Direct Prohs Of Direct Propportion.ortion.
Consider the following Direct Proportion situation :
It takes 2 h...

0 2 4 6 8 10 12
2
4
6
8
10
No of ladders.
Hours
Graph Of Ladders Made against Time Taken.

L
T
o
Key Fact.
All Direct Proportion graphs are straight
line graphs passing through the origin:
Look at the table of val...

Complete the tables below given that they form direct proportion graphs:
(1) F 0 1 2 3 4 5
G 80 4 12 16 20
(2) D 0 3 6 10 ...

0 1 2 3 4 5
10
20
30
G
H
What Goes In The Box ? 3What Goes In The Box ? 3
Complete the tables below for direct proportion ...

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Direct, indirect and partitive prop... by mhera gabayoyo 106322 views
direct and inverse variations by Manpreet Singh 35637 views

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