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
Incorrect: 43 = 4 × 3
Correct: 43 = 4 × 4 × 4
Mistake #2:
Incorrect: -32 = -3 × -3 = 9
Correct: -(3 × 3) = -9
Mistake #3:
Mistake #4:
Incorrect: -5 + 15 = -20
Correct: -5 + 15 = 10
|
Incorrect:
√9 + 16
|
=
√9
|
+
√16
= 3 + 4 = 7
|
|
Correct:
√9 + 16
|
=
√25
= 5
|
|
Incorrect:
√9 + 16
|
=
√9
|
+
√16
= 3 + 4 = 7
|
|
Correct:
√9 + 16
|
=
√25
= 5
|
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
|
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
|
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
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