Length







In the following table of Length, all the units are arranged from small units to Big units.
Millimeter is the smallest unit and Kilometer is the biggest unit.

Unit
Value
1 Millimeter
1/1000 meter
1 Centimeter
1/100 meter
1 Decimeter
1/10 meter
1 Meter
Basic unit
1 Decameter
10 Kilometer
1 Hectometer
100 meter
1 Kilometer
1000 meter

S B D
Small → Big → ÷

OR

B S M
Big → Small → X


Example:-
1) Convert 2520 m in km.
Solution :Here, 2520 m is in smaller unit as compare to km>
∴ From above S(Small)→ B(Big) →÷
⇒ from the table 1m = 0.001 km
∴ 2520 m = 2520 / 1000 = 2.52 km
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2) Convert 3 m to cm.
Solution : Here meter is bigger unit than cm
Big(B) → Small(S) → X
∴ 1m = 100 cm
⇒ 3 m = 3 x 100 = 300 cm
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3) Convert 125 mm to cm.
Solution : Here millimeter(mm) is smaller unit than cm
Small(S) → Big(B) → ÷ (division)
∴ 1cm = 10 mm
⇒ 125 mm = 125 ÷ 10 = 12.5 cm
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4) A grasshopper which can go 25 cm with one hop would have gone how many meters in 75 hops?
Solution: 75 x 25 = 1875 cm would have been covered.
As we want the answer in meter and cm is smaller unit than meter.
So S → B → ÷
∴ 1875 cm = 1875 / 100 = 18.75m
The grasshopper would have gone 18.75 m.
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5) If each ant is 8 mm in length, how long is the line in cm if in a line there are 11 ants?
Solution : 11 x 8 = 88 mm long.
millimeter is smaller unit than centimeter.
So S → B → ÷
∴ 88 mm = 88 /10 = 0.8 cm

Measurements
Length
Weight
Capacity

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