Common Math errors

3.  Mathematics is the science that deals with the
logic of shape, quantity and arrangement.
 Math is all around us, in everything we do.
 It is the building block for everything in our
daily lives, including mobile devices,
architecture (ancient and modern), art,
money, engineering, and even sports.

4.  Careless Errors
 Computational Errors
 Conceptual Errors

5.  Careless errors occur simple because they are
not playing attention or are working too fast.
1. Copying the problem wrong to begin with.
2. Writing a wrong number.
3. Dropping a negative sign.
4. Sloppy handwriting.

6.  The second type of mistake is computational.
This means somewhere in process they
incorrectly added,subtraction,multiplied or
divided.

7.  Conceptual errors occur because kids have
misunderstood the underling concept or have
used incorrect logic.

8.  4-2=2
 2-4= -2
 +4+2=+6
 -4-2=-6
 -5*(+2)=(-5)*(+2)=-10
 -5*(+2)=(-5)*(-2)=+10

9. Examples

10.  Solve 43 = 4 × 3
 Correct: 43 = 4 × 4 × 4

11.  solve-(3)2 = -3 × -3 = 9
 Correct: -(3 × 3) = -9

12.  Incorrect: 8/0
 = 0
 Correct: 8/0
 = No answer!

13.  Solve -5 + 15 = -20
 Correct:
 -5 + 15 = 10

14.  Solve
 √9 + 16
 √9+√16
 3 + 4
 7
 Correct:
 √9 + 16
 √25
 5

15.  Solve : y3 × y2 = y6
 Correct: y3 × y2 = y5

16.  Solve : (2y)4 = 2y4
 Correct : (2y)4 = 16y4

17.  solve 4 × (2z + 5) = 4 × 2z + 5
 Correct: 4 × (2z + 5) = 4 × 2z + 4 × 5

18.  Solve
50 – 3 × 2
= 47 × 2
= 94
 Correct
50 – 3 × 2
= 50 – 6
= 44

19.  solve:
x + 10 = 20
x + 10 - 10 = 20 - 10
0 = 10
 Correct:
x + 10 = 20
x + 10 - 10 = 20 - 10
x + 0 = 10

20. Square 4x

21. Square -3

25. Questions

26.  -2 + (-6) = ________?
 -4 + 3 = _________ ?
 5 − (- 2)= _________?

27.  -2 × 4 =__________ ?
 -6 ÷(- 2)=____________?

28.  Solve for n: 6n + 12 = 6?

29.  Solve x2=16?

30.  Solve 2x(x-2)=x(x-1)?