Square Any 2 Digit Number In Your Head

Maths Trick - Squaring any 2 digit number - In your head!

An easy and fast maths trick to quickly calculate any number squared in your head!!


1. If your number is between 1 and 9 then you can just learn the answer from memory.

2. Work out what multiple of 10 is closest to your number.
For example 20 is the closest multiple of ten to 22.

3. Calculate the difference between the multiple of ten and your number.

4. Add the difference to your original number.

5. Multiply the new number by the multiple of ten.
For example 20 x 24 = 480.

6. Add the difference squared to this number (2 squared = 4).
480 + 4 = 484.


Example 1.

Square 42.

1. 40 is the closest multiple of ten.
2. The difference is 2.
3. 2 add 42 = 44.
4. 44 x 40 = 1760.
5. The difference squared is 4.
6. 4 add 1760 = 1764.


Example 2.

Square 67.

1. 70 is the closest multiple of ten.
2. The difference is 3.
3. 67 minus 3 = 64.
4. 70 x 64 = 4480.
5. The difference squared is 9.
6. 9 add 4480 = 4489.