OPERATIONS
What operation is needed to solve the equation:
p − 254 = 765?
Addition
Write an equation for: “A number increased by 5 equals 12.”
x + 5 = 12
Solve: x − 5 = −2
x = 3
What is the inverse operation of multiplication?
Division
Write an equation for: “5 less than a number is 20.”
x - 5 = 20
Solve: x/3 = 4
x = 12
What operation would isolate x in: x + 9 = 15?
Subtraction
Solve: 2x − 13 = 1
x = 7
True or False: To undo subtraction, you subtract. If falso, givethe correct answer.
False, add.
Miss Violet has 16 granola bars and needs 100 total. Boxes have 12 bars. Write an equation that works.
16 + 12x = 100
Solve: −5n + 8 = 43
n = -7
What operation would isolate x in: 7x = 70?
Division
A contractor buys 525 metal bars (b). The wholesaler gives him a discount of $475. The total price is $3,750. Write an equation to find the cost of one metal bar.
525b − 475 = 3750
Solve 3(5b + 6) = 48
b = -0.8