🎯 Learning outcomes
- Use standard units of length, mass and capacity
- Convert between km, m, cm, mm; kg, g; L, mL
- Solve problems with mixed units
Before you start: Multiplying and dividing by 10, 100 and 1000.
📖 Explanation
Length: 1 km = 1000 m, 1 m = 100 cm, 1 cm = 10 mm. Mass: 1 kg = 1000 g. Capacity: 1 L = 1000 mL.
To change a bigger unit to a smaller unit, multiply (2.5 kg = 2500 g). To change a smaller unit to a bigger unit, divide (750 cm = 7.5 m).
When adding measurements, first make the units the same: 2 m 40 cm + 85 cm = 240 cm + 85 cm = 325 cm = 3 m 25 cm.
The distance from Delhi to Agra is about 230 km, which is 2,30,000 m. A 2 L bottle of water fills eight 250 mL glasses.
✗ 1 kg of cotton is lighter than 1 kg of iron
✓ Both have the same mass, 1 kg; cotton just takes up more space.
🧪 Try this activity
Use a measuring jug to find how many 250 mL cups fill a 1 L bottle and a 2 L bottle.
✍️ Question bank with answers
Tap an option to check multiple-choice answers. Open “Answer” or “Marking points” for the others.
-
3 km =
Answer
C. 3000 m
1 km = 1000 m, so 3 km = 3000 m.
-
4500 g =
Answer
A. 4.5 kg
4500 ÷ 1000 = 4.5.
-
How many 200 mL glasses can be filled from 1 L?
Answer
A. 5
1000 ÷ 200 = 5.
-
6 m = ___ cm
Answer
600
-
2 L 300 mL = ___ mL
Answer
2300
-
Add 1 kg 750 g and 2 kg 400 g.
Marking points
- 1750 g + 2400 g = 4150 g
- 4 kg 150 g
-
A tailor has 10 m of cloth. Each shirt needs 1 m 60 cm. How many shirts can he make and how much cloth is left?
Marking points
- 10 m = 1000 cm, 1 m 60 cm = 160 cm
- 1000 ÷ 160 = 6, remainder 40
- 6 shirts, 40 cm left
-
A medicine dose is 5 mL. How many doses are in a 100 mL bottle?
Answer
- 100 ÷ 5
- 20 doses
-
A truck carries 2.5 tonnes of rice in 50 kg bags (1 tonne = 1000 kg). How many bags?
Answer
- 2.5 × 1000 = 2500 kg
- 2500 ÷ 50 = 50 bags
🎲 Practice more
A new set of questions every time you press the button. Tap an option to check it and see why. Maths, science, computer and commerce sets get fresh numbers and pictures on every try.
Turn on JavaScript to get practice sets.