CBSE Class 5 Mental Maths Perimeter And Area Worksheet - Free Printable

Educational worksheet: CBSE Class 5 Mental Maths Perimeter And Area Worksheet. Download and print for classroom or home learning activities.

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Let’s solve problem 10 step by step.

We are told the perimeter of the figure is 26 cm.
Perimeter means the total length around the shape — so we add up all the sides.

Looking at the figure, the sides are:
- Top: x cm
- Right top: 3 cm
- Right bottom: 3 cm
- Bottom: 8 cm
- Left bottom: 2.5 cm
- Left top: 2.5 cm

So, adding them all together:

x + 3 + 3 + 8 + 2.5 + 2.5 = 26

Now let’s add the known numbers:

3 + 3 = 6
6 + 8 = 14
14 + 2.5 = 16.5
16.5 + 2.5 = 19

So now we have:

x + 19 = 26

To find x, subtract 19 from both sides:

x = 26 - 19
x = 7

✔ Double-check:
7 + 3 + 3 + 8 + 2.5 + 2.5 =
7 + 6 = 13; 13 + 8 = 21; 21 + 5 = 26 → Correct!

Final Answer:
7

Parent Tip: Review the logic above to help your child master the concept of perimeter and area worksheet for 5th grade.

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