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Year 2 Measurements - Mass
Very light things, like this feather, have their weight measured in grams.

Year 2 Measurements - Mass

Spot mass like a scientist! Learn to read scales, choose grams or kilograms, estimate sensibly, and check increments so your measurements are accurate every time.

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Fascinating Fact:

Read the scale. Look at the numbers and the little lines. If each small line is 50 g, five lines is 250 g.

In KS1 Maths, pupils compare mass using grams (g) and kilograms (kg). They estimate first, then read scales carefully by spotting the interval each small line represents.

  • Mass: How heavy something is.
  • Gram (g): A small unit for mass, used for light objects.
  • Kilogram (kg): A larger unit for mass; 1 kg = 1,000 g.

Practice measuring: Numeracy Game – quick challenges that include reading scales and real-life problems.

How do I read a weighing scale in KS1?

Find two numbered marks, count how many small lines between them, then work out the value of each line. Land on the nearest line and read the mass.

When should I use grams and when kilograms?

Use grams for small, light items like fruit or crayons. Use kilograms for heavier things like a pet carrier or a big bag of rice.

What does “interval” on a scale mean?

The interval is how much each small line is worth. If ten lines go from 0 to 500 g, each line is 50 g.

To see a larger image, click on the picture.
Question 1
How much might this little mouse weigh?
20kg
20g
2kg
2g
Mice are very light and certainly wouldn't weigh kilograms!
Question 2
How heavy could this elephant be?
5g
500g
5kg
5000kg
Elephants are very heavy indeed!
Question 3
What could be the combined weight of the dog and cat?
35g
3kg
25kg
305g
The dog might weigh about 20kg and the cat might weigh about 5kg
Question 4
How much could the go kart weigh?
80g
8g
8kg
80kg
All the other weights are far too light
Question 5
How much might this butterfly weigh?
1g
1kg
10kg
100g
Butterflies have to be very light in order to fly!
Question 6
How much might one of these books weigh?
300kg
300g
3g
3kg
An average book weighs less than a kilogram
Question 7
How heavy might the toy truck be?
300kg
300g
3g
30kg
The truck is probably less than a kilogram
Question 8
How heavy might one of the lunch boxes be?
10kg
10g
100kg
1kg
The lunch box would be too heavy to carry if it was 100kg!
Question 9
How heavy might one of these apples be?
60g
60kg
6g
6kg
Most apples are less than 100g
Question 10
How much might these children weigh altogether?
100g
100kg
1000kg
10g
Each child could have an average weight of 25kg, so 4 of them would weigh 100kg
You can find more about this topic by visiting BBC Bitesize - Compare mass

Author:  Angela Smith (Primary School Teacher & KS1 Quiz Writer)

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