CBSE Class 5 Mathematics Can You See Pattern Worksheet Set 04

Question. In the magic star write the numbers from 1 to 12 in ○ such that the sum of 4 numbers in a row is 26
Answer: Arrange the numbers from 1 to 12 into the twelve circles so that every straight line of four circles adds up to 26.
The sums along the six lines are:
- Row 1: \( 8 + 12 + 4 + 2 = 26 \)
- Row 2: \( 7 + 3 + 5 + 11 = 26 \)
- Row 3: \( 1 + 12 + 6 + 7 = 26 \)
- Row 4: \( 1 + 4 + 10 + 11 = 26 \)
- Row 5: \( 9 + 3 + 6 + 8 = 26 \)
- Row 6: \( 9 + 5 + 10 + 2 = 26 \) In simple words: Write each number from 1 to 12 in a circle so every line of four numbers makes 26.

Exam Tip: Always balance high numbers like 11 and 12 with low numbers like 1 and 2 along each line to hit the target total.

II. Guess and Write

Question 1. What is my secret number?
* It is larger than half of 100.
* It is more than 6 tens and less than 7 tens.
* The tens digit is one more than one's digit.
* Together the digits have a sum of 11.
Answer: The secret number is 65.

Here is how we find it step-by-step:
- Half of 100 is 50, so the number is bigger than 50.
- More than 6 tens (60) but less than 7 tens (70) means the tens digit must be 6.
- The tens digit is 1 more than the ones digit, so the ones digit is \( 6 - 1 = 5 \).
- Adding both digits gives \( 6 + 5 = 11 \), which matches the clue.
In simple words: The number is between 60 and 70. Its tens digit is 6, so its ones digit is 5, giving 65.

Exam Tip: Break number riddles into single clues and find the tens digit first before working out the ones digit.