One Step Equations Error Analysis

Solve the equation: 8q = 40

• q = 5

• q = 20

• q = 10

• q = 2

Solve the equation: 6r = 54

• r = 12

• r = 10

• r = 9

• r = 6

Solve the equation: 7s = 63

• s = 11

• s = 9

• s = 10

• s = 8

Solve the equation: 9t = 81

• t = 9

• t = 7

• t = 12

• t = 18

• Yes; because 28 divided by 4 is equal to 7

• No; because they should multiply each side by 4

Solve the equation: 20 ÷ z = 5

• 10

• 2

• 15

• 4

Solve the equation: 18 ÷ m = 6

• 2

• 4

• 9

• 3

Error Analysis

A student solved the equation incorrectly.

Mark which step the student made an error

Find the error in the problem below
19 - 2k = 3k - 1
     +3k   +3k
19 + 1k = -1
-19           -19
k = -20

• They should have divided by 1 for the last step

• They should add 19 instead of subtracting 19

• I can not find an error

• Instead of adding 3k they should subtract 3k

Solve the equation for n:

-(n - 8) = -2

• n = 6

• n = 10

• n = -10

• n = -6