Addition and Subtraction Word Problems, Estimate

Front

Point A on the number line represents the number of students at Braeburn Elementary School. Which statement is true? Options: The number of students at Braeburn Elementary School is more than 4,000. The number of students at Braeburn Elementary School is about 3,000 because point A is closer to 3,000. The number of students at Braeburn Elementary School is about 4,000 because point A is closer to 4,000.

Back

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

Front

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?

Options: 200, 100, 400, 300

Back

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

Answer explanation

Yes, the best estimate is 100.

Tags

Math

Front

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?

Back

$747

Answer explanation

Correct! 575 + 172 = ?

Tags

CCSS.3.OA.D.8

Front

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.

Back

982 - 682

Answer explanation

Yes, you subtract to find the difference.

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Front

Jim has 587 marbles. Andy has 215 more marbles than Jim. What is the best estimate of the number of marbles Andy has?

Back

800

Answer explanation

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

Front

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?

Back

921

Answer explanation

Yes, 348 + 573 = 921

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Front

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?

Back

298

Answer explanation

Yes, 500 - 202 = 298

Tags

CCSS.3.OA.D.8

Front

A library has 358 fiction books. It has 65 more autobiography books than fiction books. How many autobiography books does the library have?

Back

423

Answer explanation

Yes, 358 + 65 = 423

Tags

CCSS.3.OA.D.8

Front

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?

Back

146

Answer explanation

Yes, 384 - 238 = 146

Tags

CCSS.3.OA.D.8