G6 Chapter 7 Mathardy

Solve Mentally

100

a/8 = 7

a = 56

200

a - 8 = 18

a = 26

300

a - 60 = 100

a = 160

400

a + 11 = 24

a = 13

500

8a = 72

a = 9

Addition Equations

100

a + 3 = 8

a = 5

200

a + 8 = 12

a = 4

300

a + 6 = 21

a = 15

400

a + 30 = 120

a = 90

500

A stunt airplane is flying at 150 feet. It ascends to 325 feet. Write and solve an addition equation to find the change in altitude of the airplane.

Equation: 150 + x = 325

Solution: x = 175

Subtraction Equations

100

a - 5 = 4

a = 9

200

a - 21 = 49

a = 70

300

a - 180 = 300

a = 480

400

a - 1,820 = 980

a = 2,800

500

Virginia lost 12 marbles. She still has 24 marbles. Write and solve a subtraction equation to figure out how many marbles she had to start.

Equation: x - 24 = 12 OR x - 12 = 24

Solution: x = 36

Multiplication Equations

100

5a = 25

a = 5

200

25a = 625

a = 25

300

18a = 486

a = 27

400

108a = 2268

a = 21

500

Paula has $18 in her wallet. This is 3 times the money in her pocket. Write and solve a multiplication equation to find how much money Paula has in her pocket.

Equation: 18 = 3x

Solution: x = 6

Division Equations

100

a/7 = 9

a = 63

200

a/8 = 12

a = 96

300

a/10 = 15

a = 150

400

a/8 = 13

a = 104

500

A bag of Super Dog dog food at $12.85 is one third the price of a bag of Power Dog dog food. Write and solve a division equation to find the price of Power Dog dog food.

Equation: 12.85 = x/3

Solution: x = 38.55