Operations on whole numbers

Elena read 3 chapter books in one month.

• She read a book with 217 pages on week 1.
• She read a book with 465 pages on week 2 and 3.
• She read a book with 107 pages on the 4th week.

Which is the best estimate of the number of pages Elena read these 4 weeks?

• 900

• 700

• 1,000

• 800

Eight students can fit at one cafeteria table. About how many tables are needed for 231 students?

• 30 tables

• 40 tables

• 10 tables

• 60 tables

Canned Food Drive

Mrs. Bee’s Class 234 cans

Mr. Tay’s Class 245 cans

Mr. Camp's Class 239 cans

Ms. Lane’s Class 217 cans

Whose class collected about 240 cans?

• Mrs. Bee's

• Mr. Tay's

• Mr. Camp's

• Ms. Lane's

To train for a race, Jesse rode his bike for 48 minutes every day for 17 days. He estimates that he rode his bike for about 400 minutes in all. Which of the following statements is true?

• Jesse estimated correctly.

• Jesse rode his bike for about 1,000 minutes.

• Jesse rode his bike for about 70 minutes.

• Jesse rode his bike for about 500 minutes.

Michael jogged 8 miles on Monday and Tuesday, and 12 miles on Friday. About how far did Michael jog altogether?

• 32 miles

• 28 miles

• 20 miles

• 30 miles

Mrs. Dasen estimated the difference of 32 and 27 to be 0. Is she correct? If she is wrong, what is the right estimate?

• she is correct, 0 is right

• she is wrong, 10 is correct

• she is wrong, 5 is correct

• she is wrong, 59 is correct

In the Forestwood Middle School cafeteria all of 6th grade eats lunch at the same time. There are 25 rectangular lunch tables and about 35 students at each table. How many students eat lunch at the same time?

• 175 students
• 875 students
• 625 students
• 1,525 students

There are 567 books in a library. If 245 books are borrowed, about how many books are left in the library?

• 330

• 320

• 350

• 100

Marbles are sold in bags of 25. A shop has 16 bags. How many marbles are there altogether?

• 450

• 425

• 400

• 500

20 teachers teach in a school of 200 students. Next year 50 more students join the school. How many more teachers would the school need now?

• 5

• 6

• 20

• 10