Learn these easy mental math tricks and impress all your friends and family.
They’ll think you’re a genius and they’ll finally show you the respect you deserve. AND shame on your teacher… sheesh… teaching you the hard way to do math. It’s about time someone showed you an easier way. Some of these mental math tricks may seem a little tricky at first to learn, but once you get the hang of them you’ll be doing math in you head in no time!
Impress your friends, your family… a new lover? New fancy cars are an outdated technique to capture the attention of someone special, use your new mind powers instead! The best way to remember these mental math tricks and shortcuts is practicing them.
Table of Contents
- 1 Multiply any Two Digit Number by 11
- 2 Square any number ending in 5
- 3 Divide any number by 5
- 4 Multiply any number by 5
- 5 Multiply up to 19 x 19
- 6 Square any two digit number
- It might take you awhile but after a few practice problems, you’ll improve speed!
- The Best App I use for Mental Math Tricks:
- For more Mental Math Tricks, visit these great sites below:
- If you’re a visual learner, here are some great videos on mental math tricks:
1 Multiply any Two Digit Number by 11
In this example we’ll choose: [math]36*11=396[/math]
[math]396[/math] It’s that easy! Remember : In case you happen to get a 10 or above in step 1, you must remember to carry the one over. For Example: [math]49*11=539[/math] is achieved by adding both digits [math]4+9=13[/math]. Then we place the answer of 13 in the middle 4 13 9 . HOWEVER, you can only have a single digit in the middle, so you have to carry the 1 over to the 4, resulting in [math]539[/math]. Try an Alternate Way: See video on multiplying large numbers by 11 |
2 Square any number ending in 5
In this example we’ll choose: [math]35^2=2025[/math]
This one is really simple to get the hang of. Square the first digit, add the same digit to it, and then add 25 on the end of it and Presto! |
3 Divide any number by 5
In this example we’ll choose: [math]2253/5=450.6[/math]
Love this one. Really what we are doing is multiplying 2253 by 1/5 or 2/10 which means multiply by 2 and divide by 10 which is a super easy way vs dividing by 5. |
4 Multiply any number by 5
In this example we’ll choose: [math]486*5=2430[/math]
Same principle as dividing by 5. What we are doing is multiplying 486 by 5/1 or 10/2 which means multiply by 10 and divide by 2 which is a super easy way vs multiplying by 5. |
5 Multiply up to 19 x 19
In this example we’ll choose: [math]14*13=182[/math]
This one might seem a little hard at first, but once you get the hang of it, it’s really easy. |
6 Square any two digit number
In this example we’ll choose 23 to square. [math]23^2[/math]
This one requires more steps to remember so it’s a little more difficult to remember. Try an Alternate way: See video on quickly squaring numbers |
It might take you awhile but after a few practice problems, you’ll improve speed!
The Best App I use for Mental Math Tricks:
- Mathemagics – Extremely helpful!
For more Mental Math Tricks, visit these great sites below:
- Businessinsider.com: 10 Mental Math Tricks
- Glad2teach.co.uk – Fast Math Calculation Tricks
- Cut-the-knot.org – Rapid Arithmetic
- Angelfire.com – Fantastic Math Tricks
- Student-Tutor.com – Mental Math Tricks
If you’re a visual learner, here are some great videos on mental math tricks:
Visit these youtube channels: