You can work with a letter without even thinking about the specific number or numbers. These variables used as symbols and stand for an unknown value. You can begin using various letters instead of a box in your open sentences. This thinking can help you solve problems by creating equations.
Consider: 4 + 5 = 9
This is similar to: n + 5 = 9. Solving for n:
n + 5 = 9
4 + 5 = 9
n = 4
y + 6 = 10
y = 10 – 6
y = 4
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Question 1 of 4
1. Question
Solve the following equations.

x + 2 = 3
+ 2 = 3
x =
3 + n = 12
3 + = 12
n =
4m =28
4 x m = 28
4 x = 28
m =
3d = 15
3 x = 15
3 x = 15
d =
k ÷ 3 = 6
÷ 3 = 6
k =
Correct 11 / 11 PointsIncorrect / 11 Points 

Question 2 of 4
2. Question
Solve the following equations.

3 + m = 16
m = 16 –
m =
5x = 40
x = 40 ÷
x =
y – 5 = 15
y = 15 +
y =
3z = 24
z = ÷
z =
12 – m = 7
m = 12 –
m =
Correct 11 / 11 PointsIncorrect / 11 Points 

Question 3 of 4
3. Question
Solve the equation.
2x + 5 = 29

Working:
2n + 5 = 29
2n = 29 –
2n =
n = ÷
n =
Correct 5 / 5 PointsIncorrect / 5 Points 

Question 4 of 4
4. Question
Solve the equation:
5a – 12 =68

Working:
5a – 12 =68
5a = 68 –
a = ÷
a =
Correct 4 / 4 PointsIncorrect / 4 Points 