Name: 
 

Lesson 5: Solving Equations Using Mental Math



 1. 

Select the correct solution to the equation.
       5a = 135
a.
15
b.
27
c.
25
d.
17
 

 2. 

Select the correct solution to the equation.
        13 + a = 52
a.
39
b.
27
c.
42
d.
19
 

 3. 

Select the correct solution to the equation.
        a – 5 = 47
a.
25
b.
38
c.
52
d.
18
 

 4. 

Select the correct solution to the equation.
      mc004-1.jpg
a.
1055
b.
1050
c.
10.5
d.
500
 

 5. 

Select the correct solution to the equation.
       3n + 4 = 67
a.
11
b.
19
c.
25
d.
21
 

 6. 

Select the correct solution to the equation.
     7a mc006-1.jpg 5 = 79
a.
15
b.
11
c.
12
d.
16
 

 7. 

Andrew earns $8 per hour. How many hours would he have to work to earn $256?
a.
32
b.
41
c.
28
d.
36
 

 8. 

Jake’s Movie Rentals charges $3 plus $2 per day to rent a movie. How many days can Erin rent a movie for with $13?
a.
3
b.
7
c.
5
d.
2
 

 9. 

Sophia deposits $75 into a savings account and then deposits $40 a week into the account. How long will it take her to have $675 in her savings account?
a.
10 weeks
b.
15 weeks
c.
8 weeks
d.
21 weeks
 

 10. 

Richard is collecting pennies in a jar. He starts with 30 pennies and then adds 12 pennies each day. How long will it take for him to have 720 pennies in the jar?
a.
55 days
b.
58 days
c.
64 days
d.
60 days
 



 
Check Your Work     Start Over