Common mistakes in math 



Find here a list of common mistakes in math made by students on a regular basis. Check the list and avoid making them yourself

Mistake #1:


Incorrect: 43 = 4 × 3

Correct: 43 = 4 × 4 × 4


Mistake #2:


Incorrect: -32 = -3 × -3 = 9

Correct: -(3 × 3) = -9


Mistake #3:


Incorrect:
8 / 0
= 0


Correct:
8 / 0
= No answer!



Mistake #4:


Incorrect: -5 + 15 = -20

Correct: -5 + 15 = 10


Mistake #5:


Incorrect: 9 + 16
= 9
+ 16 = 3 + 4 = 7


Correct: 9 + 16
= 25 = 5


Mistake #5:


Incorrect: 9 + 16
= 9
+ 16 = 3 + 4 = 7


Correct: 9 + 16
= 25 = 5


Mistake #6:


Incorrect:
x + 8 > 10
x + 8 - 8 < 10 - 8
x = 2

Correct:
x + 8 > 10
x + 8 - 8 > 10 - 8
x > 2


Mistake #7:


Incorrect: y3 × y2 = y6

Correct: y3 × y2 = y5


Mistake #8:


Incorrect: (2y)4 = 2y4

Correct: (2y)4 = 16y4


Mistake #9:


Incorrect: 4 × (2z + 5) = 4 × 2z + 5

Correct: 4 × (2z + 5) = 4 × 2z + 4 × 5


Mistake #10:


Incorrect:
x + 10 = 20
x + 10 - 10 = 20 - 10
0 = 10

Correct:
x + 10 = 20
x + 10 - 10 = 20 - 10
x + 0 = 10


Mistake #11:


Incorrect:
6x + 3 / 6x + 2
=
3 / 2


Correct:
6x + 3 / 6x + 2
=
6x + 3 / 6x + 2



Mistake #12:


Incorrect:
x + 10 = 20
x + 10 - 10 = 20 - 10
0 = 10

Correct:
x + 10 = 20
x + 10 - 10 = 20 - 10
x + 0 = 10


Mistake #11:


Incorrect:
6x + 3 / 6x + 2
=
3 / 2


Correct:
6x + 3 / 6x + 2
=
6x + 3 / 6x + 2



Mistake #12:


Incorrect:
x + 10 = 20
x + 10 - 10 = 20 - 10
0 = 10

Correct:
x + 10 = 20
x + 10 - 10 = 20 - 10
x + 0 = 10






New math lessons

Your email is safe with us. We will only use it to inform you about new math lessons.


Page copy protected against web site content infringement by Copyscape

Recent Articles

  1. Calculate the Harmonic Mean

    Jan 13, 17 01:28 PM

    What is the harmonic mean? How to calculate the harmonic mean?

    Read More