Mental Math Competition "final" G4

In a school, there are 12 classes and 30 teachers.

In each class, there are 35 students. How many students are there in total?

• 247

• 360

• 280

• 420

A printing company has 6 printing machines.

All 6 printing machines together can print 222 pages in a minute. How many pages can each machine print per hour?

• 1,332 Pages

• 37 Pages

• 2,220 Pages

• 350 Pages

There are 3 teams of maintenance staff. If each team take 8- hour shifts and has 4 members, how many maintenance staff are there?

• 24 Maintenance staff

• 32 Maintenance staff

• 6 Maintenance staff

• 12 Maintenance staff

Hamdan got 365 comments on his uploaded video. He reacted with a heart to 162 comments and replied to 74 other comments by “liking” them. How many comments did he reply to? How many comments did he not reply to?

• Hamdan replied to 220 comments.

  Hamdan did not reply to 145 comments.

• Hamdan replied to 236 comments.

  Hamdan did not reply to 129 comments.

• Hamdan replied to 190 comments.

  Hamdan did not reply to 175 comments.

• Hamdan replied to 235 comments.

  Hamdan did not reply to 130 comments.

A play center has an indoor playground and 4 party rooms. Children can go in to play or have their birthday parties there.

The center is open for 11 hours each day. Each party takes 3 hours. What is the maximum number of parties the center can host in a day?

• 22 parties in a day.

• 44 parties in a day.

• 12 parties in a day.

• 33 parties in a day.

There are 4 doctors working in a clinic. Each doctor has 2 nurses assisting them. There are two receptionists, Jay, and Molly, working at the reception.

How many people are working in the clinic?

• 8

• 12

• 17

• 14

A bakery specializing in donuts and croissants opens at 10 o’clock in the morning.

The bakery baked 160 donuts and 180 croissants before the shop is opened.

How many baked goods were there in total?

• 180

• 360

• 160

• 340

"Use estimation and rounding to choose the appropriate answer"

In the morning, there are about 452 planes taking off from the airport and 127 of the planes are delayed for more than 15 minutes. About ________ planes take off within 15 minutes of the scheduled time.

• 450

• 330

• 130

"Use estimation and rounding to choose the appropriate answer"

The distance between two bus terminals is 390 km. It takes the bus 4 hours to go from one terminal to another. The speed of the bus is about ________ km per hour.

• 100

• 400

• 386

• 140

The library is being relocated. The librarians are busy organizing the books.

Three boxes filled with fiction books and two boxes filled with reference books were just delivered. If each box is filled with 120 books, how many fiction books are there?

• 240

• 40

• 60

• 360