Creating Equations

Mrs. Rucker made 24 tacos. Her family ate 13 of them. Then Mrs. Rucker made 12 more tacos. Which equation can be used to find t, the number of tacos she had then?

• 24 + 13 - 12 = t

• 24 + 13 + 12 = t

• 24 - 13 + 12 = t

• 24 - 13 - 12 = t

Ansie bought 2 bags with 10 bows and 3 bags with 14 bows. She used 23 of the bows on graduation gifts she wrapped. Which equation can be used to solve for b, the number of bows Ansie has left? 

• (2 x 10) + (3 x 14) - 23 = b

• (2 x 10) + 14 - 23 = b

• 2 x 10 + 3 x (14 + 23) = b

• (2 + 10) x (3 + 14) - 23 = b

The total weight of a computer hard drive, a monitor, and a keyboard is 362 ounces.  The hard drive weighs 318 ounces and the monitor weighs 33 ounces.  Which equation represents the situation where k is the weight of the keyboard?

• 362 = 318 + 33 - k

• 362 = 318 + 33 + k

• 362 = 318 + k

• 362 = 318 - k

At Lincoln Elementary School, the fifth-grade students have a total of 325 pets. Of these pets, 250 are some kind of pet other than cats. Which equation could be used to determine the number of pets that are cats, c?

• 325 + 250 = c

• 325 – 250 = c
  

• 325 × 250 = c

• 325 ÷ 250 = c

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

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

Olivia bought a notebook for $12.50 and 9 pens. If her total was $43.73, how much was each pen?

• 12.5x +9 = 43.73

• 73.43 = 12.5x + 9

• 12.5 - 9x = 43.73

• 43.73 = 12.5 + 9x

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