📏 Measurement and Conversion
Class 5 Maths · Unit 9 of 12 · about 120 minutes
This unit builds on earlier work with length, weight and capacity. Children learn the metric units for length (km, m, cm, mm), weight (kg, g) and capacity (L, mL), and convert between units within each system. They apply these conversions to solve real-life word problems involving mixed units and to estimate measures. This unit is essential for later work in perimeter, area, volume, and money.
What your child will learn
- Students will be able to convert between units of length: km to m, m to cm, cm to mm, and the reverse.
- Students will be able to convert between units of weight: kg to g and g to kg.
- Students will be able to convert between units of capacity: L to mL and mL to L.
- Students will be able to solve word problems involving addition and subtraction of measurements expressed in mixed units.
- Students will be able to estimate the length, weight or capacity of everyday objects using appropriate units.
Lessons in this unit
- Length units: km, m, cm, mm: Understand the relationship between units of length and convert between them. Use a conversion table and real-life examples.
- Weight units: kg and g: Understand the relationship between kilograms and grams and convert between them. Use real-life examples like groceries.
- Capacity units: L and mL: Understand the relationship between litres and millilitres and convert between them. Use real-life examples like water bottles and medicine.
- Word problems with mixed units: Solve addition and subtraction word problems involving measurements in mixed units (e.g., m and cm, kg and g, L and mL). Use conversion and regrouping.
- Estimating measures: Estimate the length, weight, or capacity of everyday objects using appropriate units. Use benchmarks like the height of a door, the weight of an apple, the capacity of a water bottle.
Key words
- kilometre (km)
- A unit for measuring long distances, like the distance between two cities. 1 km = 1000 m.
- metre (m)
- A unit for measuring length, like the height of a door. 1 m = 100 cm.
- centimetre (cm)
- A small unit for measuring length, like the width of your finger. 1 cm = 10 mm.
- millimetre (mm)
- A very small unit for measuring length, like the thickness of a coin. 10 mm = 1 cm.
- kilogram (kg)
- A unit for measuring weight, like a bag of rice. 1 kg = 1000 g.
- gram (g)
- A small unit for measuring weight, like a paperclip. 1000 g = 1 kg.
- litre (L)
- A unit for measuring liquid, like a bottle of water. 1 L = 1000 mL.
- millilitre (mL)
- A very small unit for measuring liquid, like a spoon of medicine. 1000 mL = 1 L.
- convert
- To change from one unit to another without changing the amount, like 2 m = 200 cm.
Help your child at home
What to watch for
- 1 m = 100 cm, so 1 km = 100 cm.
- Help: Use a conversion table: 1 km = 1000 m, and 1 m = 100 cm, so 1 km = 1000 × 100 = 100,000 cm.
- 1 kg = 100 g.
- Help: Remember: 1 kg is a big weight, so it takes 1000 small grams to make it. 1 kg = 1000 g.
- 1 L = 100 mL.
- Help: Remember: 1 litre is a big amount, so it takes 1000 small millilitres to make it. 1 L = 1000 mL.
- Add the metres and centimetres separately without regrouping: 2 m 50 cm + 1 m 75 cm = 3 m 125 cm.
- Help: Add the centimetres first: 50 + 75 = 125 cm. Since 100 cm = 1 m, regroup 125 cm as 1 m 25 cm. Then add the metres: 2 + 1 + 1 = 4 m. So the answer is 4 m 25 cm.
Try this at home
- Convert 3 km to m
- Convert 3 kg to g
- Convert 3 L to mL
- Add 2 m 50 cm and 1 m 75 cm
Quick questions to ask aloud
- How many metres are there in 1 kilometre? (100 / 1000 / 10 / 10000)
Show answer
1 kilometre is a long distance. It is equal to 1000 metres. So the answer is 1000. - A bag of rice weighs 2 kg. How many grams is that?
Show answer
1 kg = 1000 g, so 2 kg = 2 × 1000 = 2000 g. - A water bottle holds 2 L. How many millilitres is that?
Show answer
1 L = 1000 mL, so 2 L = 2 × 1000 = 2000 mL.
Frequently asked questions
What will my child learn in "Measurement and Conversion" (Class 5 Maths)?
Your child will be able to: convert between units of length: km to m, m to cm, cm to mm, and the reverse.; convert between units of weight: kg to g and g to kg.; convert between units of capacity: L to mL and mL to L.; solve word problems involving addition and subtraction of measurements expressed in mixed units.; estimate the length, weight or capacity of everyday objects using appropriate units..
How does MangoMindz teach "Measurement and Conversion"?
In 5 short parts (Length units: km, m, cm, mm, Weight units: kg and g, Capacity units: L and mL, Word problems with mixed units, Estimating measures). Each part has a picture-based lesson read aloud by Mango Teacher, a quick check, and a quiz built from common mistakes children make, with Mango, a study buddy, for questions.
How long does "Measurement and Conversion" take?
About 120 minutes in total, spread over 5 parts of 15–25 minutes each.
How can I help my child with "Measurement and Conversion" at home?
Work through a small example together, such as: Convert 3 km to m; Convert 3 kg to g. Then ask a quick question aloud: How many metres are there in 1 kilometre? (100 / 1000 / 10 / 10000)
What mistakes do children often make in "Measurement and Conversion"?
1 m = 100 cm, so 1 km = 100 cm. Fix: Use a conversion table: 1 km = 1000 m, and 1 m = 100 cm, so 1 km = 1000 × 100 = 100,000 cm. 1 kg = 100 g. Fix: Remember: 1 kg is a big weight, so it takes 1000 small grams to make it. 1 kg = 1000 g. 1 L = 100 mL. Fix: Remember: 1 litre is a big amount, so it takes 1000 small millilitres to make it. 1 L = 1000 mL.
Is "Measurement and Conversion" free on MangoMindz?
Yes. Every lesson part and quiz in "Measurement and Conversion" is free on MangoMindz, with no ads.