← Class 6 unitsComputational Thinking
Class 6
Chapter 3: Number Play
Numbers have rich properties — they can be even/odd, prime/composite, factors of others. Spotting these properties helps in mental maths and puzzles.
Learning outcomes
- Decompose numbers using place value
- Reason about properties of numbers
Activities
- Number-tricks investigation
Worked examples
Read through these first, then try the practice below.
Example 1 — Sum of digits
What is the sum of the digits of 4729?
Solution: 4 + 7 + 2 + 9 = 22.
Example 2 — Even or odd
Is the product 17 × 24 even or odd?
Solution: Any number times an even number is even. 24 is even, so the product is even.
Self-do practice
Question 1 of 3 · Score 0/0What is the sum of digits of 1234?
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