Starter quiz
- Mass is what we are measuring when we find out how __________ something is.
- long
- heavy ✓
- tall
-
- One gram is __________ one kilogram.
- heavier than
- lighter than ✓
- the same as
-
- Which of these objects have the mass of about one gram?
- A bunch of bananas
- A paper clip ✓
- A laptop
- A raisin ✓
-
- Choose a sensible measurement. A rabbit has a mass of about __________.
- 1 gram
- 1 metre
- 1 kilogram ✓
-
The mass of this parcel is ______ kilograms.- '12' ✓
The mass of this packet is ______ grams.- '85' ✓
Exit quiz
- We use a __________ to compare the mass of objects.
- ruler
- balance ✓
- metre stick
-
Compare the masses of the eraser and the pencil. The eraser is __________ the pencil.- lighter than
- the same as
- heavier than ✓
-
The children are comparing the mass of a book, a pencil case and a bean bag. Match the parts of the sentence correctly.- The book is⇔the heaviest object. ✓
- The bean bag is⇔the lightest object. ✓
- The pencil case is⇔heavier than the beanbag but lighter than the book. ✓
The objects have been ordered, starting with the lightest. Which statements are true?- The stone is the heaviest object. ✓
- The block is heavier than the toy car.
- The toy car is heavier than the block. ✓
- The stick is the lightest object. ✓
-
- Compare the masses. 7 g is __________ 7 kg.
- heavier than
- equal to
- lighter than ✓
-
- Order the masses starting with the lightest.
- 1⇔25 kg
- 2⇔32 kg
- 3⇔52 kg
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- When the units are the same, you can compare masses in the same way as we compare 2-digit numbers.
- When the units are the same, you can order masses in the same way as we order 2-digit numbers.
- When the units are different, you can compare masses by looking at the unit rather than the numbers.
Common misconception
Children often believe that the size of the item relates to its mass and that a larger item will always be heavier than a smaller item.
Explore examples where the larger item is lighter and the smaller item is heavier to address this misconception. For example, compare the mass of an inflated balloon with a stone, or an empty box with a small bag full of coins.
Keywords
Lighter - When one object has less mass than another, it is lighter.
Lightest - When an object has the least mass than all the others in a set, it is the lightest.
Heavier - When one object has more mass than another, it is heavier.
Heaviest - When an object has the greatest mass than all the others in a set, it is the heaviest.
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