STAAR-Based Assessment: Estimation and Compatible Numbers

About how much money does the Johnson family need to go on vacation?

• The Johnson family needs more than $9,000.

• The Johnson family needs less than $8,000.

Which expression shows the best way to estimate the sum of the apples and plums?

• 300 + 170

• 300 + 100

• 300 + 160

• 300 – 200

Which expression shows the best way to estimate the difference between Joseph’s and Sandra’s scores?

• 90 – 60

• 90 – 50

• 100 – 60

• 90 + 50

If they had 36 bottles remaining at the end of the festival, about how many bottles of bubbles did they hand out?

• 110

• 120

• 190

• None of the above

About how many water balloons did the family order?

• 200, because point B is less than halfway between 200 and 300

• 300, because point B is more than halfway between 200 and 300

• Both A and B

• None of the above

Sam had 32 dimes in his collection jar. He decided to use 15 dimes to buy a candy bar. What is the best estimate for the number of dimes Sam has left?

• 20

• 10

• 30

• 50

If she earns the same amount each week, about how much money will Suzie make after 2 weeks?

• $90, because point P is more than halfway between 80 and 90

• $160, because point P is less than halfway between 80 and 90

• $80, because point P is less than halfway between 80 and 90

• $180, because point P is more than halfway between 80 and 90

A soccer team had 128 ounces of water to drink during their game. They drank 112 ounces of the water. Which is the best way to estimate the amount of water left?

• 130 + 110

• 120 – 110

• 130 – 100

• 130 – 110

Which statement best describes the number of people who work at the company?

• The number of people is less than 1,000.

• The number of people is greater than 2,000.

• The number of people is about 2,000, because the point is closer to 2,000.

• The number of people is about 1,000, because the point is closer to 1,000.

Ms. Coyle had 312 pencils at the beginning of the year for her students to use. By the middle of the year, they had used 127 of the pencils. Which expression can be used to find out how many pencils Ms. Coyle had left, if the numbers are rounded to the nearest ten or hundred?

• 300 – 200

• 310 – 120

• 300 – 130

• 310 – 130