Building Equations

Pedro ordered 24 boxes of baseballs.  Each box contained 16 baseballs.  Pedro used 8 of these baseballs during a game.  Which equation can be used to find b, the total number of these baseballs that Pedro did NOT use during the game?

• b = (24 + 16) - 8

• b = (24 x 16) - 8

• b = (24 - 16) / 8

• b = (24 x 16) + 8

Mr. Anderson had 185 pieces of wood.  He sold 25 pieces of wood to his neighbor and stacked the rest of the wood into piles around his house.  Each pile of wood contained 40 pieces of wood.  Which equation can be used to find p, the number of piles of wood Mr. Anderson made?

• p = (185+25)+40 

• p = (185−25)−40 

• p=(185+25)×40 

• p=(185−25)÷40 

Jana has two boxes of 12 cookies. She shares the cookies equally among 4 people. Which equation shows how to find the number of cookies, c, each person got?

• 12 ÷ 4 = c

• 12 ÷ c = 4

• 2(12) ÷ 4 = c

For a school assembly, 304 students are to be seated in rows with 16 students in each row. How many rows of students will be seated for the assembly? Let r be the number of rows.

• r = 304 ÷ 16

• r = 16 ⋅ 304

• 304r = 16

• r = 16 ÷ 304

• 16r = 304

A scuba diver dove 16 ft to an elevation of -50 ft. What was her elevation before the dive?

Which equation matches the scenario?

• x - 1/6 = 50

• x - 16 = -50

• 1/6 x = 50

• -50 = 16x

The difference between 5 times a number and 3 is 12.

• 3h - 5 = 12

• 5h - 12 = 3

• 5h - 3 = 12

• 12h - 3 = 3

If one roll of masking tape costs $1.15, how many rolls can Emma buy with $5.75?

• 1.15(5.75) = x

• 5.75x = 1.15

• 1.15x = 5.75

• x = 1.15/ 5.75

If one roll of masking tape costs $1.15, how many rolls can Emma buy with $5.75?

• 1.15(5.75) = x

• 5.75x = 1.15

• 1.15x = 5.75

• x = 1.15/ 5.75

A number divided by 3 is 10.

• 3n=10

• 3-n=10

• n/3=10