The document RD Sharma Solutions (Part - 2) - Ex-2.1, Fractions, Class 7, Math Class 7 Notes | EduRev is a part of the Class 7 Course RD Sharma Solutions for Class 7 Mathematics.

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**What should be added to **

Let *x* be the required fraction.

According to the question:

**Suman studies for hours daily. She devotes hours of her time for Science and Mathematics. How much time does she devote for other subjects?**

Suman studies for hours daily. Therefore, we have

She studies science and mathematics for hours. Therefore, we have

Time devoted to other subjects = Total study time âˆ’- Time devoted to science and mathematics

**A piece of wire is of length If it is cut into two pieces in such a way that the length of one piece is what is the length of the other piece? **

Let the length of second piece be *x*.

Total length of wire = Length of one piece + Length of second piece

**A rectangular sheet of paper is ** **wide. Find its perimeter.**** **

Perimeter of rectangle = 2(length + width)

**In a "magic square", the sum of the numbers in each row, in each column and along the diagonal is the same. Is this a magic square?**

Sum along columns and rows:

Since, all the sums in the square are equal along rows,columns and diagonals,it is a magic square.

The cost of Mathematics book is Rs and that of Science book is Rs Which costs more and by how much?

Cost of mathematics book =

Cost of Science book =

Thus, Mathematics book costs more.Difference in the cost of Mathematics and Science book =cost of Mathematics bookâˆ’Cost of Science book

So, Mathematics book costs more by Rs

(i) Provide the number in box and also give its simplest from in each of the following: