RBSE Solutions Class 5 Maths Chapter 8 Patterns Exercise 8.1

Question 1. Understand the following patterns and complete them.


Answer:

In simple words: Look closely at how the shapes and arrows change. For the arrows, they follow a simple repeating sequence. For the shapes, they shift position in each row. Find the rule and extend the pattern for the next two steps.

🎯 Exam Tip: When completing patterns, first identify the rule (e.g., repeating sequence, rotation, addition, subtraction) and then apply it consistently to find the next elements.

Question 2. Complete the series
(i) 7, 12, 17, 22, ......
(ii) 10, 20, 30, 40, ......
(iii) 29, 24, 19, 14, ......
Answer:
(i) 7, 12, 17, 22, 27, 32
(ii) 10, 20, 30, 40, 50, 60
(iii) 29, 24, 19, 14, 9, 4
In simple words: For each list of numbers, find out if a number is being added or subtracted to get the next one. Then, keep doing that same action to fill in the empty spaces.

🎯 Exam Tip: Always check if the difference between consecutive numbers is constant (addition/subtraction) or if there's a multiplication/division pattern, or a more complex sequence.

Question 3. Complete the following number pyramids.
(i)
(ii)
Answer:
(i)
(ii)
In simple words: For pyramid (i), multiply the two numbers below a block to get the number inside it. For pyramid (ii), add the two numbers below a block to get the number inside it. Fill in all the missing blocks by following the correct rule for each pyramid.

🎯 Exam Tip: Number pyramids can follow different rules (addition, subtraction, multiplication, division). Always figure out the rule for the bottom layer first, then apply it step-by-step upwards to complete the pyramid.