CBSE Class 6 · Computational Thinking · 2026-27
Number Play: Worksheet
Skills: Algorithmic thinking, Pattern recognition, Decomposition. Circle the correct answer. Show your working in the space beside each question.
- Which is the first palindrome year after 1991?
- Arrange the digits of 4213 to make the largest and smallest numbers. What is largest − smallest?
- Rule: if a number is even, halve it; if it is odd, multiply by 3 and add 1. Starting from 6, how many steps to reach 1?
- The digits of a number add up to 9. Which must be true?
- A cell is a “supercell” if its number is bigger than its neighbours. In the row 23 | 41 | 18 | 56 | 37, how many supercells are there?
- How many different 3-digit numbers can you make using the digits 1, 2 and 3 once each?
Answer key: Number Play
- (b) 2002 – No year between 1992 and 2001 is a palindrome, so 2002 is the first.
- (a) 3087 – Repeating this step with any 4-digit number (not all digits the same) eventually reaches 6174, Kaprekar’s constant.
- (c) 8 – So it takes 8 steps.
- (b) It is divisible by 9 – A number is divisible by 9 when its digit sum is divisible by 9.
- (b) 2 – 37 < 56, so no. There are 2 supercells.
- (b) 6 – 3 choices × 2 arrangements = 6 numbers.