Sometimes party tricks can be useful short cuts, too. These math tricks also happen to be short cuts to squaring:
- Numbers that end in 5
- Numbers in the 40s
- Numbers in the 50s
This cheat sheet also includes two short cuts with similar techniques: catalunyafarm.com
- Multiplying two numbers in the 90s
- Multiplying two digit numbers that end in 1
If you get no other sheet, this is really the sheet to get!