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SAI International School
CLASS-VII

Mathematics
CHAPTER-11: Area and Perimeter
LESSON NOTES-6

SUBTOPIC: Conversion of Units and its Applications

Conversion of Units: Conversion of units is the conversion between different
units of measurement for the same quantity.
 Here, we convert different units while measuring areas to another unit.
 We know that 1 m = 100 cm
2
Now 1 m = 1 m x 1 m
2
= 100 cm x 100 cm = 10000 cm
 1 km = 1000 m
2
1 km = 1 km x 1 km
= 1000 m x 1000 m
= 1000000 m 2

2
2
 1 hectare = 100 × 100 m = 10,000 m
 100 cm = 1 m
1
1 cm = m
100
2
1 cm = 1 cm x 1 cm
1 1
= m x m
100 100
1
2
= m
10000
2
2
1000 cm = 1000 m = 0.1 m 2
10000
2
2
 1000 cm = 1000 × 100 mm
= 100000 mm 2
Useful Link:https://www.youtube.com/watch?v=x7jWT3VhdDk

Applications in real life: You must have observed that quite often, in gardens
or parks, some space is left all around in the form of path or in between as cross
paths.

 A framed picture has some space left all around it.
 We need to find the areas of such pathways or borders when we want to find
the cost of making them.