Addition and Subtraction Word Problems, Estimate

Point A on the number line represents the number of students at Braeburn Elementary School.

Choose the statements that best describe the number of students at Braeburn Elementary School.

Select ALL the correct answers.

• A. The number of students at Braeburn Elementary School is more than 3,000.

• B. The number of students at Braeburn Elementary School is less than 3,000.

• C. The number of students at Braeburn Elementary School is less than 4,000.

Answer explanation

Yes, it is between 3,000 and 4,000

Tags

CCSS.6.NS.C.7A

CCSS.6.NS.C.7B

Point A on the number line represents the number of students at Braeburn Elementary School.

Which statement is true?

• A. The number of students at Braeburn Elementary School is more than 4,000.

• B. The number of students at Braeburn Elementary School is about 3,000 because point A is closer to 3,000.

• C. The number of students at Braeburn Elementary School is about 4,000 because point A is closer to 4,000.

Answer explanation

Yes, it is closer to 4,000 because it is more than halfway between 3,000 and 4,000

Tags

CCSS.3.OA.D.8

CCSS.4.OA.A.3

CCSS.7.EE.B.3

Point B on the number line represents the distance between Sam’s house and his school.

About how many miles is Sam’s house from his school?

• A. 200, because point B is more than halfway between 100 and 200.

• B. 100, because point B is less than halfway between 100 and 200.

• C. 400, because point B is more than halfway between 100 and 400.

• D. 300, because point B is less than halfway between 100 and 300.

Answer explanation

Yes, the best estimate is 100.

Tags

Math

Cindy had some money in the bank. With this money she bought a new table for $575. Now she has $172 in

the bank.

How much money did Cindy have at the beginning?

Answer explanation

Correct! 575 + 172 = ?

Tags

CCSS.6.EE.B.7

The mass of an elephant is 982kg while the mass of a lion is 682kg.

Write an equation that can be used to represent the DIFFERENCE between the mass of the elephant and the mass of the lion.

Answer explanation

Yes, you subtract to find the difference.

Tags

CCSS.4.OA.A.3

Jim has 587 marbles. Andy has 215 more marbles than Jim.

What is the best estimate of the number of marbles Andy has?

• 790

• 800

• 400

• 700

Answer explanation

Yes, 587 rounded to the hundreds place is 600, and 215 rounded to the hundreds place is 200. 600 + 200 = 800

Tags

CCSS.3.OA.D.8

CCSS.4.OA.A.3

CCSS.7.EE.B.3

A grocery store has 348 bags of tortilla chips and 573 bags of corn chips. How many bags of tortilla chips and

corn chips does the grocery store have?

Answer explanation

Yes, 348 + 573 = 921

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Susan read 202 pages of a book. The book is 500 pages long. How many more pages does Susan need to read to

finish the book?

Answer explanation

Yes, 500 - 202 = 298

Tags

CCSS.3.OA.D.8

A library has 358 fiction books. It has 65 more autobiography books than fiction books. How many autobiography

books does the library have?

Answer explanation

Yes, 358 + 65 = 423

Tags

CCSS.3.OA.D.8

Mr. Tom has 384 pear trees on his farm. Mr. Raimi has 238 pear trees on his farm. What is the difference

between the numbers of pear trees in these two farms?

Answer explanation

Yes, 384 - 238 = 146

Tags

CCSS.3.OA.D.8