• Length: Metric unit of lengths are used in meters, kilometers, centimeters, millimeters, etc.

 10 millimeters (mm) 1 centimeter (cm) 10 centimeters 100 millimeters 100 centimeters 1 meter (m) 100 meters 1 kilometer (km) 1 Ft 12 Inch 1 Mile 5280 Foot

• Capacity: It can be measured in liters, kiloliters, etc.

 Kiloliter (kl) 1,000 liters Liter (l) 1 liter Centiliter (cl) 0.01 liter Milliliter (ml) 0.001 liter 1 Pound(lb) 16 Ounce (oz)

• Mass: Mass is generally the measurement of weight and there are three main units of mass considered as M, Kg, S.

 M The meter of length Kg The kilogram of mass S The second for timed

Example:

• Convert 7.5 km into meters.

Sol: 1 km = 1000 m

7.5 km = (7.5×1000) m = 7500 m

• Convert 753 mm into cm

Sol: 1 mm = 0.1 cm = 1/10 cm

753 mm = 75.3 cm

• Convert 746 kl into liters.

Sol: 1 liter = 1000 kl

746 kl = 746/1000 liters = 0.746 liters

• How many foot are there is 48 inches?

Sol: 1 Foot = 12 inches

48 inches = (48/12) foot = 4 foot

• Convert 9.7 kg into grams.

Sol: 1 kg = 1000 gm.

IMPORTANT: Units should be same while addition and subtraction of numbers.

9.7 kg = 9.7×1000 = 9700 grams

Practice Exercise

• Seema runs 2.86 km every day. How far does Seema run in a week?

• Varun is 3.12 m tall. His younger brother is 28 cm taller than him. What is his brother’s height?

• The length of tower A is 335.6 m and the length of tower B is 456.4 m. By how many meters tower B is taller than tower A?

• Convert the following:
1. 02 m = ____ cm
2. 5436 m = ____ km
• 765 mm = ____ cm
1. 89 liter = ____ ml
2. 167 oz = ____ lb

1. 68 km 20 m and 23 km 21 m
2. 245 grams and 4.5 kg

• Subtract:
1. 750 grams from 8 kg
2. 238 liters from 6 kl

RECAP

• 1 km = 1000 m, 1 kg = 1000 gm, 1 kl = 1000 l
• 1 meter = 100 cm
• 1 cm = 10 mm
• 1 foot = 12 inches
• 1 Pound = 16 ounce
• Make sure the units of amounts should be same at the time of addition and subtraction. You cannot add 100 gm and 100 kg.