Suppose we want to solve

      ⎕ − 3 = 5

We have to find the missing number


In algebra,

We don’t write boxes

It has a variable − x


We write letters, like 𝑥


It has a variable − x

But, why write 𝑥? Why not boxes ?

  • Writing x is easier to write than ⎕
  • if there are two boxes, now do you tell which box is which ?

So let’s start ?

  1. Chapter 12 Class 7 Algebraic Expressions
  2. Concept wise

About the Author

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.