Adding & Subtracting Equations

The sum of a number x and 5 equals 20.

• $5x\ =\ 20$
  

• $x\ +\ 5\ =\ 20$
  

• 
  

  $20\ \div x\ =\ 5$

• $x\ -\ 5\ =\ 20$

64 equals 33 more than a number y.

• $64\ =\ 33\ +\ y$

• $64\ =\ 33\ -\ y$

• $64\ =\ 33y$

• $64\ =\ 34\ \div\ y$

A number c decreased by 12 is 4.

• $c\ +\ 12\ =\ 4$

• $12c\ =\ 4$

• $12\ \div\ c\ =4$

• $c\ -\ 12\ =\ 4$

10 is the quotient of a number s and 8.

• $s\ \div\ 8\ =\ 10$

• $8s\ =\ 10$

• $s\ +\ 8\ =\ 10$

• $s\ -\ 8\ =\ 10$

You went grocery shopping with $40.65. You left the store with $5.10. Write an equation you can use to find the cost c of the groceries.

• $40.65\ \times\ c\ =\ 5.10$

• $40.65\ -\ c\ =\ 5.10$

• $5.10\ +\ c\ =\ \text{40.65}$

• $40.65\ \div\ c\ =\ 5.10$

SOLVE: x + 3 = 8

• x = 5

• x = 11

• x = 24

• x = 10

SOLVE: x - 4 = 14

• x = 4

• x = 10

• x = 18

• x = 14

SOLVE: x + 2 = 10

• x = 8

• x = 12

• x = 10

• x = 4

SOLVE: x - 6 = 6

• x = 0

• x = 12

• x = 36

• x = 1

SOLVE: x + 8 = 21

• x = 29

• x = 13

• x = 10

• x = 8