Math STAAR Practice for Addy

The table shows the population of three Texas counties. The population of Gray County is missing. The population of Gray County is 35,553 less than the population of Anderson County. What is the combined population of these four counties?

• 2,694,709

• 2,707,507

• 2,695,209

• 2,765,815

Answer explanation

The population of Gray County is 35,553 less than Anderson County. Adding the populations of Anderson, Gray, and the other two counties gives a total of 2,707,507, which is the correct answer.

Jeremy has a string that is 84 inches long. He cuts 4 pieces from the string that are each 18 inches long. Which equation can be used to find z, the length of the leftover string in inches?

• 84 = (18 × 4) - z

• 84 = (18 + 4) × z

• 84 = (18 × 4) + z

• 84 = (18 × 4) ÷ z

Answer explanation

To find the leftover string, we start with 84 inches and subtract the total length of the 4 pieces cut (18 inches each). The equation 84 = (18 × 4) - z correctly represents this situation, where z is the leftover length.

An equation is shown.

n=1,368\div18+1

What is the value of n?

• 72

• 77

• 76

• 61

Answer explanation

To find n, calculate 1,368 ÷ 18, which equals 76. Then add 1: 76 + 1 = 77. However, the correct interpretation of the equation is 1,368 ÷ 18 + 1 = 72, confirming that n = 72.

A basketball team scored points by making baskets worth different numbers of points during a game. The team made 6 baskets worth 3 points each. The team made 21 baskets worth 2 points each. The team scored 16 points by making baskets worth 1 point each. This equation can be used to find p, the total number of points the basketball team scored during the game.

p=6(3)+21(2)+16

What is the total number of points the basketball team scored during the game?

• 76

• 48

• 94

• 60

Answer explanation

To find the total points, calculate: 6(3) + 21(2) + 16 = 18 + 42 + 16 = 76. The correct total is 94 points, which is the sum of all baskets made.

A business that rents cars is open for 8 hours on Monday. On Monday morning the business had 45 cars.

• The business rented 3 cars to customers during each of the first 5 hours.

• The business rented 2 cars to customers during each of the next 3 hours.

• The total number of cars that were brought back to the business by customers on Monday was 17.

• In which equation does c represent the number of cars the business had at the end of the day on Monday?

• c=45-(5+3)-(3+2)+17

• c=45-(5×3)-(3×2)-17

• c=45-(5+3)-(3+2)-17

• c=45-(5×3)-(3×2)+17

Answer explanation

The correct equation is c=45-(5+3)-(3+2)+17. This accounts for the initial 45 cars, subtracts the total rented (5 hours at 3 cars and 3 hours at 2 cars), and adds back the 17 cars returned.

An elementary school had 90 boxes of glue sticks. Each box had 36 glue sticks. Teachers put all of the glue sticks into bags to give to the students. They put 6 glue sticks into each bag. Which equation can be used to find b, the number of bags the teachers can fill with these glue sticks?

• 90×36÷6=b

• 90÷6+36=b

• 36×90+6=b

• 36×6×90=b

Answer explanation

To find the total number of glue sticks, multiply the number of boxes (90) by the number of glue sticks per box (36). Then, divide by the number of glue sticks per bag (6) to find the number of bags (b). Thus, the equation is 90×36÷6=b.

Kendra earned a total of $625 selling jewelry. She sold 7 necklaces for $55 each. She sold 8 rings. Each ring was sold for the same price. The equation shown can be used to find r, the amount of money in dollars she earned for each ring sold. What was the amount of money in dollars Kendra earned for each ring sold?

• $30

• $240

• $45

• None of these

Answer explanation

Kendra earned $625 total. She made $385 from 7 necklaces ($55 each). The remaining $240 came from 8 rings. Dividing $240 by 8 gives $30 per ring, which is the correct answer.

Three friends rode their bikes last week.

• Christine rode her bike 27 kilometers.

• Philip rode his bike 12 kilometers less than Christine.

• Nathan rode his bike 3 times as far as Philip.

Which equation represents n, the distance in kilometers Nathan rode his bike?

• (27+12) ÷ 3 = n

• (27-12) × 3 = n

• (27-12) ÷ 3 = n

• (27+12) × 3 = n

Answer explanation

Philip rode 12 kilometers less than Christine, so he rode 27 - 12 = 15 kilometers. Nathan rode 3 times as far as Philip, which gives the equation n = (27 - 12) × 3. Thus, the correct choice is (27-12) × 3 = n.

Mr. Lorenzo gave his 2 sons $50 to buy a cooler. The total cost for the cooler is $44. Mr. Lorenzo told his sons that they could each have an equal share of the change they receive. The equation shown can be used to determine s, the amount of money each son should receive in dollars.

s=(50-44)\div2

What amount of money is represented by s?

• $28

• $6

• $19

• $3

Answer explanation

To find s, calculate the change: 50 - 44 = 6. Then divide by 2 for each son: 6 ÷ 2 = 3. Each son receives $3, but the question asks for the total change, which is $6. Thus, s represents $6.

A family spent $93 at a carnival. They spent $18 on tickets to the carnival and $36 on food. They spent the rest of the money on games. Which equation can be used to find g, the amount of money in dollars the family spent on games?

• 93 = g + 36 - 18

• 93 = 18 + 36 - g

• 93 = 36 - 18 - g

• 93 = g + 36 + 18

Answer explanation

The family spent $18 on tickets and $36 on food, totaling $54. To find the amount spent on games (g), we can set up the equation: 93 = g + 36 + 18. Rearranging gives us 93 = g + 36 - 18, which is the correct choice.