# NCERT Class 7 Mathematics Solutions: Chapter 2 – Fractions and Decimals Exercise 2.1 Part 4

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6. Sum of the third column

Given,

So,

()

7. Sum of first diagonal (left to right)

Given,

So,

()

8. Sum of second diagonal (left to right)

Given,

So,

()

Here, the sum of fractions in each row, in each column and along the diagonals are same, therefore it is a magic square.

**Question 4:** A rectangular sheet of paper is long and wide. Find its perimeter.

**Answer:**

Given,

The sheet of paper is in rectangular form.

Length of sheet and

Breadth of sheet .

So,

Perimeter of rectangle = 2 (length + breadth)

Thus, the perimeter of the rectangular sheet is .