Introduction
At the market, Mujinga looks at some bananas. Some are long. Others are short. She wants to put them in order. In this lesson, you will order objects from longest to shortest. You will also order them from heaviest to lightest.
🇨🇩 Space and size
Ordering by size
⏱ 15 minOfficial programme: CD-M3-GRA-01
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🎯 In this lesson, you will learn to
- Order objects longest to shortest, heaviest to lightest, and back.
The lesson
Explanation
Long and short
We compare two objects side by side. We line up the starting ends.
- The one with more length is long.
- The other is short.
Example: a pencil is longer than a bottle cap. The bottle cap is shorter than the pencil.
Explanation
Order from longest to shortest
Take three sticks. First find the longest. Put it first. Then find the shortest. Put it last. The stick left goes in the middle.
📏 Long → medium → short
You can also order backwards: from shortest to longest.
Explanation
Heavy and light
To compare weight, we hold objects in our hands. A bucket full of water is heavy. An empty bucket is light.
A stone is heavier than a feather. A feather is lighter than a stone.
We order from heaviest to lightest, or from lightest to heaviest.
Worked example
Problem: Kalala has three pencils. The red one is the longest. The blue one is the shortest. The green one is in between. Order them from longest to shortest.
Step 1: The longest is red. It is first.
Step 2: The shortest is blue. It is last.
Step 3: Green goes in the middle.
Answer: red, green, blue.
Worked example
Problem: A bag of cassava is heavier than a bag of peanuts. The bag of peanuts is heavier than a bag of chili peppers. Order from lightest to heaviest.
Step 1: The heaviest is cassava.
Step 2: The lightest is chili peppers.
Step 3: We order from lightest to heaviest.
Answer: chili peppers, peanuts, cassava.
Watch out
Watch out: to compare lengths, line up the starting ends well. If one object starts farther along, you will be wrong. Also check the direction: “longest to shortest” is not “shortest to longest”.
Key points
Remember:
- We compare length: long, short.
- We compare weight: heavy, light.
- We line up objects to compare.
- We order from biggest to smallest, or backwards.
✍️ Exercises
Answer one exercise at a time. Your answer is checked right away, with an explanation.
Exercise 1 of 8
★ EasyA canoe is longer than a stick. Which one is shorter?