Mental Math/Estimation
Multplying by 1-Digit
Multiplying 2 x 2
Multiplying 2 x 3
Operations/Missing or Extra Information

100

In our school library, there are 40 bookshelves. Each bookshelf holds 300 books. How many total books are in the library? A. 12 B. 120 C. 1,200 D. 12,000
What is D. 12,000?

100

809 x 5 =
What is 4,045?

100

48 x 91 =
What is 4,368?

100

426 x 91 =
What is 38,766?

100

Jennie has 2 cats, both of which just had kittens. Zippy has twice as many kittens as Fuzzy. Jennie's friends adopt 5 of the kittens. What do you need to know to find out how many of the kittens Jennie keeps? A. The total number of kittens B. How old the kittens are now C. How many friends Jennie has D. The date when the kittens are born
What is A. The total number of kittens?

200

Which two numbers have an estimated product of about 800? A. 46 x 18 B. 42 x 38 C. 22 x 51 D. 39 x 17
What is D. 39 x 17?

200

186 x 9 = A. 1,674 B. 1,684 C. 1,774 D. 2,674
What is A. 1,674?

200

89 x 57 = A. 5,083 B. 6,073 C. 5,073 D. 5,084
What is C. 5,073?

200

965 x 24 = A. 23,152 B. 23,960 C. 24,160 D. 23,160
What is D. 23,160?

200

Aspen collects baseball cards. He ordered 8 sets of baseball cards to add to his collection. Each set had 17 baseball cards and cost $6.00. How many baseball cards did Aspen get in his order?
What is 136 baseball cards?

300

David can type 71 words per minute. Which is the best estimate of the number of words David can type in 8 minutes? A. Less than 500 words B. Between 500 and 600 words C. Between 600 and 700 words D. More than 700 words
What is B. Between 500 and 600 words?

300

A delivery truck travels 346 miles each day for 5 days. What is the total number of miles the truck travels? A. 1,500 miles B. 1,523 miles C. 1,700 miles D. 1,730 miles
What is D. 1,730 miles?

300

Gaby's favorite basketball player averaged 32 points in his last 20 games. How many points did the basketball player make in all 20 games? A. 6,400 B. 64 C. 640 D. 560
What is C. 640?

300

The Randolph High School Auditorium has 218 rows. Each row has 42 seats. How many seats does the Randoph High School Auditorium have all together?
What is 9,156 seats?

300

At Randolph Elementary, there are 28 classes. Each class has 18 students. There are 32 teachers at the school. What is the total number of students at Randolph Elementary? A. 504 B. 576 C. 896 D. Not Here
What is A. 504?

400

Ms. Hemenway works 80 hours each pay period. Her salary is $20 per hour. How much money does she earn in 10 pay periods? A. $160,000 B. $16,000 C. $1,600 D. $160
What is B. $16,000?

400

An airline ticket cost $355. Mrs. Byrd wants to buy 4 tickets for her family. How much will she pay in all?
What is $1,420?

400

A parking lot has 68 rows wtih 24 parking spaces in each row. What is the total number of parking spaces? A. 1,632 B. 1,502 C. 408 D. 272
What is A. 1,632 parking spaces?

400

Cookies come in 5-pound boxes, with 14 boxes to a case. The store ordered 125 cases. How many pounds of cookies did the store order?
What is 8,750 pounds?

400

Max works on 16 cars each day. Which equation can be used to find c, the number of cars Max worked on in 7 days? A. c = 16 + 7 B. c = 16 - 7 C. c = 16 x 7 D. c = 16 / 7
What is C. c = 16 x 7?

500

The Texas state tree is the pecan. Pecans grow about 19 inches per year. Estimate about how many inches of growth a group of 882 pecans would gain in 5 years. Is your answer an overestimate or an underestimate?
What is 90,000 inches? What is an overestimate?

500

Ms. Carruthers pays $925 each month for rent. She has been in her apartment for 30 months. How much has she paid for rent in all?
What is $27,750?

500

The sports field at Randolph Elementary School is shaped like a rectangle. The field is 72 yards long and 46 yards wide. What is the area of the field in square yards?
What is 3,312 square yards?

500

Alyssa made 138 bags of cookies for the fifth grade. She put 28 cookies in each bag. What is the total number of cookies Alyssa used to make the baskets? A. 3,365 B. 3,964 C. 4,864 D. Not Here
What is D. Not Here?

500

Zoe buys 16 Snickers bars each month. They cost $2.00 a piece. Which equation can be used to find s, the number of Snickers bars in 12 months? A. s = 16 - 12 B. s = 16 x 12 C. s = 16/19 D. s = 16 x 12 x 2
What is B. s = 16 x 12?