Comparing and sorting
Lesson 10 of 11
Sorting by one rule
Objective. Sort a set of objects into two groups using a single property.
The key idea
A sorting rule splits everything into two groups: things that follow the rule and things that do not. Every object must land in exactly one group.
Worked example
Sort 2, 5, 8, 9 by 'is it even?'
- 1Even numbers end in 0, 2, 4, 6 or 8.
- 2Even: 2, 8.
- 3Not even: 5, 9.
Answer: Even: 2, 8 · Not even: 5, 9
Practice
Each question comes with a picture and a listen button. Try it first, then reveal the answer.
Common mistake. Changing the rule halfway through sorting.
Your progress
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