Forming Equations – Find the Number

# Forming Equations – Find the Number

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• Forming Equations – Find the Numbers
• Example 1
• Example 2
• Summary
• What’s Next?

In the previous segment of the chapter ‘Simple Equations,’ we looked at Forming equations.

In this segment, we will learn how to find numbers.

## How to form equations to find numbers?

Let us understand how to form equations to find numbers with the help of the following two examples:

## Example 1

12 subtracted from a number gives us 8. Find that number.

Step 1: Break the word problem into parts to form the equation.

• 12 subtracted – This means that 12 is subtracted from something.
• From a number – The number is not given. This is the number that we need to find. We will assign a variable to that number x
• Gives us 8 – This means that when 12 is subtracted from x we get 8.
• Form the equation – From the above deductions, we can arrive at the equation.

That is,

x – 12 = 8

Step 2: Solve the equation

∴ ? = 12 + 8

∴ ? = 20

## Example 2

Find a number that is 3 times the sum of 5 and 7.

## Related content

 Forming Equations Class 7 Maths | Forming Equations – Find the Parts