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Neha writes in her notebook and calls it an equation. Her teacher says it is not one. Why not?

Class 7Simple EquationsSimple Equations
  • AIt has no '=' sign, so it is only an expression
  • BIt uses subtraction instead of addition
  • CThe variable is instead of
  • DThe coefficient 6 is smaller than 11

Step-by-Step Solution

An equation must claim that two quantities are equal, so an '=' sign is compulsory. only tells you how to calculate a value — there is nothing to solve. Writing would turn it into an equation. The trap is assuming that anything containing a variable is automatically an equation.
Answer: A) It has no '=' sign, so it is only an expression

Key idea: Translating word problems into equations

Three steps:
1. **Pick a variable** for the unknown ('let be the number of …').
2. **Translate the words into an equation** using the operations the problem describes.
3. **Solve and answer in the original units.**

Example: 'Three times a number plus 7 equals 22. Find the number.'
Let = the number. Equation: . Solve: .
Answer: the number is 5.

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