variation for kids
TRANSCRIPT
MATHEMATICS CLASS 7TH
r=3cm
Radius = 6 cm
r=6cm
Radius = 3 cm
Circumference of circle increases when we increase the radius of circle.
Number of people employed is inversely proportional to the number of days taken to complete the job.
Variation comes from the word vary, it means change.
If two quantities are related so that a change in one causes a corresponding change in the other, we say one varies as the other.
Types of variation
1. Direct variation.
2. Inverse Variation.
If one quantity increases other quantity also increases, or vice versa.
Increasing the number of pencils corresponding in the increase of their cost.
Rs 5 Rs 10 Rs 15
Q: The total cost of 10 lottery tickets is Rs 20. Find the cost of 25
such tickets.
x(No. of bulbs)
5 10 15 20 25 30
y(Cost in rupees)
20 60 100
If one quantity increases other quantity decreases, or vise versa.
Q: If 8 men can do a job in 12 days, how long will 24 men take to
complete it?
No. of
men
5 10 20 40
No. of
days
8 2
Complete these phrases:
1. More jobs _______ employment.2. More Strikes ________ production.3. No pain _____ gain.4. More talk ______ action.5. The efficiency of machine ________ with
time.6. Faster we drive, ______ time we take to
cover a distance.
