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Heavier and lighter
Joyful Mathematics: Chapter 7
GoalSay which of two things is heavier and which is lighter.
New words
heavy · hard to lift, pulls downlight · easy to liftbalance · a scale that tips to the heavier side
Explanation
Hold a stone in one hand. Hold a leaf in the other hand. Which hand goes down? The stone pulls your hand down. The stone is heavier. The leaf is lighter. A balance shows it too. The heavier side goes down.
Worked examples
A pot is heavier than a spoon. The pot side goes down.
A school bag is heavier than a cap. The bag side goes down.
A big thing can be light, and a small thing can be heavy. A big kite is lighter than a small brick.
Class activity
Hand balance. Find five things at home, such as a spoon, a sock, a book, a bottle cap and a cup. Hold two of them, one in each hand. Say which feels heavier. Then put all five in a line from the lightest to the heaviest.
Practice
1
Which is heavier?
The book.
2
Which is heavier?
The melon.
3
Which is lighter, a leaf or a brick?
The leaf.
4
Can a small thing be heavy?
Yes. A small stone can be heavier than a big balloon.
5
On a balance, does the heavier side go up or down?
Down.