Compare and order measurements of mass
I can compare and order measurements of mass.
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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.
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.
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.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Mass is what we are measuring when we find out how __________ something is.
Q2.One gram is __________ one kilogram.
Q3.Which of these objects have the mass of about one gram?
Q4.Choose a sensible measurement. A rabbit has a mass of about __________.
Q5.The mass of this parcel is kilograms.
Q6.The mass of this packet is grams.
Assessment exit quiz
6 Questions
Q1.We use a __________ to compare the mass of objects.
Q2.Compare the masses of the eraser and the pencil. The eraser is __________ the pencil.
Q3.The children are comparing the mass of a book, a pencil case and a bean bag. Match the parts of the sentence correctly.
the heaviest object.
the lightest object.
heavier than the beanbag but lighter than the book.
Q4.The objects have been ordered, starting with the lightest. Which statements are true?
