Solving Mentally
Addition
Subtraction
Multiplication
Division
100

Solve m - 5 = 2 mentally.

7

100

Solve x + 4 = 5. Check your solution.

x = 1

100

Solve x - 5 = 10. Check your solution.

x = 15

100

Solve 6x = 18. Check your solution.

x = 3

100

Solve p/7 = 5. Check your solution

p = 35

200

Is 5, 6, or 7 the solution of the equation 4 + b = 10?

6

200

Solve d + 3 = 8. Check your solution.

d = 5
200

Solve r - 3 = 1. Check your solution.

r = 4

200

Solve 4x = 24. Check your solution.

x = 6

200

Solve 4 = r/8. Check your solution.

r = 32

300

Solve 20 divided by d = 5 mentally.

4

300

Solve 7 = 4 + y. Check your solution.

y = 3

300

Solve r - 4 = 16. Check your solution.

r = 20

300

Solve 21 = 3g. Check your solution.

g = 7

300

Solve x/7 = 8. Check your solution.

x = 56

400

Kevin has 60 baseball cards. There are 10 baseball cards in each package. Solve the equation 10 x b = 60 to find b, the number of packages of cards Kevin has.

6 packages.

400

Pennsylvania is 280 miles from east to west. This is 120 miles more than then length of the state from north to south. Write and solve an equation to find the length of Pennsylvania from north to south.

x + 120 = 280; 160 miles

400

After you withdraw $50 from your savings account, the balance is $124. Write and solve a subtraction equation to find your starting balance.

b - 50 = 124; $174

400

Thomas uses 4 cups of flour to make 2 loaves of banana bread. Write and solve a multiplication equation to find the number of cups of flour that are needed to make one loaf of bread.

2x = 4; 2 cups

400

One fourth of the number of students in the sixth grade participate in an after-school sport. If 42 students play sports, write and solve a division equation to find the number of students in the sixth grade.

s/4 = 42; 168 students

500

Devin and Hannah have 72 marbles together. Hannah has 12 marbles. Solve the equation 72-b = 12 to find d, the number of marbles that Devin has.

60 marbles.

500

Julie and Len went swimming. Julie swam 575 meters. This is 150 more meters than Len swam. Write and solve an addition equation to find the number of meters that Len swam.

150 + x = 575; 425 meters

500

The difference between the number of people that visit an amusement park on a Saturday and the number of people that visit the park on a Wednesday is 1,465. There are 4,320 visitors on Wednesday. How many visitors are there on Saturday? Write and solve a subtraction equation.

1,465 = x - 4,320; 5,785 visitors.

500

The Raimonde family drove 1,764 miles across the United States on their vacation. If it took a total of 28 hours, write and solve a multiplication equation to find their average speed in miles per hour.

1,764 = 28r; r = 63 miles per hour

500
Morgan cut a board into 18 inch long pieces to make a bookshelf. He could get 4 pieces out of the board. Write and solve a division equation to find the length of the original board.

b/18 = 4; 72 inches

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