Chapter 7 Β· CBSE Class 5 Maths (NCERT Math-Magic)

Can You See the Pattern?

Spot the hidden rule behind number sequences, then use it to predict what comes next.

πŸ” Chapter 7

A number sequence 3, 7, 11, 15, 19 with the plus 4 rule shown between each pair Five numbers in a row, each connected to the next by an arrow labeled plus 4, showing the pattern rule that generates the sequence 3 7 11 15 19 +4 +4 +4 +4 Each number is 4 more than the one before it
7.1

Finding the Rule in a Pattern

Every number pattern follows a rule β€” usually adding, subtracting, or multiplying by the same amount each time. Once you spot the rule, you can predict what comes next.

1

What is the rule in 3, 6, 9, 12, ...? What comes next?

Add 3 each time; next is 15

2

What is the rule in 100, 90, 80, 70, ...? What comes next?

Subtract 10 each time; next is 60

7.2

Patterns in Multiplication Tables

Multiplication tables are full of patterns β€” the ones digit repeats in a cycle, and every multiple of a number follows the same rule of that number added again and again.

1

Look at the ones digit in the table of 5: 5, 10, 15, 20, 25... What pattern do you see?

The ones digit alternates between 5 and 0

2

What is the rule connecting each number in the table of 6: 6, 12, 18, 24?

Add 6 each time

Practice

Exercises

1. What comes next in 2, 4, 6, 8, ...?

2. What is the rule in 1, 4, 7, 10, ...? What comes next?

3. What comes next in 50, 45, 40, 35, ...?

4. Look at the table of 9: 9, 18, 27, 36. What is the sum of the digits in each number?

5. What is the rule in 5, 10, 20, 40, ...? What comes next?