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Which Operation?

Decide which mathematical operation is required then use it to find the answers.

  Menu   Level 1 Level 2 Multi-step Problems More Arithmetic
No calculator

This is level 2: problems involving numbers generally up to 100. You may not need all of the information given in the question. You can earn a trophy if you get at least 7 questions correct and you do this activity online.

1) Nathaniel saw three items in an electronics shop on sale. They cost £50, £62, and £64. He decided to buy the two cheaper items. How much did those two items cost in total?

Correct Wrong

2) It takes Nevaeh five minutes to paint one fence post. How many fence posts could Nevaeh paint in three hours if she painted continuously without any breaks?

Correct Wrong

3) Nicholas planted 64 trees into 4 plots in 4 hours. He made sure that there were the same number of trees in each plot. What was his tree planting rate in trees per hour?

Correct Wrong

4) Nicole had 62 social media followers, 27 school friends and 77 extended family members. None of the school friends are also her social media followers. She decides to record contact details of followers and friends in a spreadsheet with each person taking up one row of the spreadsheet. How many rows will be needed?

Correct Wrong

5) Three fifths of the students at a large school came to school by bus. The rest (420 students) walked to school. What was the total number of students at the school?

Correct Wrong

6) Olivia was playing darts where each player starts with 501 points then subtracts the number of points earned on the dart board. The first to zero is the winner. With her first three darts Olivia scored 15, 24 and 17 points. How many more points must she score to reduce the 501 to zero?

Correct Wrong

7) Owen's book contains 85 pages. Each night before he goes to sleep he reads 12 pages. Currently he is on page 70. How many pages are left?

Correct Wrong

8) Paige was wondering whether the product of two odd numbers was odd or even. As she looked out of the bus window he noticed the following numbers on houses and a car registration number plate: 28, 29 and 99. She ignored the even number. What was the product of the odd numbers?

Correct Wrong

9) A Tran Tours bus holds 18 people. How many busses will be required to transport 96 11-year olds and 63 12-year olds on a day trip to the Lake District?

Correct Wrong

10) Find the average (mean) of the numbers below that are odd.


Correct Wrong

This is Which Operation? level 2. You can also try:
Level 1


Try your best to answer the questions above. Type your answers into the boxes provided leaving no spaces. As you work through the exercise regularly click the "check" button. If you have any wrong answers, do your best to do corrections but if there is anything you don't understand, please ask your teacher for help.

When you have got all of the questions correct you may want to print out this page and paste it into your exercise book. If you keep your work in an ePortfolio you could take a screen shot of your answers and paste that into your Maths file.

Why am I learning this?

Mathematicians are not the people who find Maths easy; they are the people who enjoy how mystifying, puzzling and hard it is. Are you a mathematician?

Comment recorded on the 24 May 'Starter of the Day' page by Ruth Seward, Hagley Park Sports College:

"Find the starters wonderful; students enjoy them and often want to use the idea generated by the starter in other parts of the lesson. Keep up the good work"

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"My Primary 7 class in Mercy Primary school, Belfast, look forward to your mental maths starters every morning. The variety of material is interesting and exciting and always engages the teacher and pupils. Keep them coming please."

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Featured Activity

Beat The Clock

Beat The Clock

It is a race against the clock to answer 30 mental arithmetic questions. There are nine levels to choose from to suit pupils of different abilities.


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Go Maths

Learning and understanding Mathematics, at every level, requires learner engagement. Mathematics is not a spectator sport. Sometimes traditional teaching fails to actively involve students. One way to address the problem is through the use of interactive activities and this web site provides many of those. The Go Maths page is an alphabetical list of free activities designed for students in Secondary/High school.

Maths Map

Are you looking for something specific? An exercise to supplement the topic you are studying at school at the moment perhaps. Navigate using our Maths Map to find exercises, puzzles and Maths lesson starters grouped by topic.


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When planning to use technology in your lesson always have a plan B!

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Description of Levels



Level 1 - Problems involving numbers generally up to 12

Level 2 - Problems involving numbers generally up to 100

Multi-step Problems - Solve multi-step problems in contexts, deciding which operations and methods to use and why.

More Arithmetic including lesson Starters, visual aids, investigations and self-marking exercises.

Answers to this exercise are available lower down this page when you are logged in to your Transum account. If you don’t yet have a Transum subscription one can be very quickly set up if you are a teacher, tutor or parent.

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Curriculum Reference

See the National Curriculum page for links to related online activities and resources.


Vocabulary for Arithmetic

You may also want to use a calculator to check your working. See Calculator Workout skill ##.

Don't wait until you have finished the exercise before you click on the 'Check' button. Click it often as you work through the questions to see if you are answering them correctly. You can double-click the 'Check' button to make it float at the bottom of your screen.

Answers to this exercise are available lower down this page when you are logged in to your Transum account. If you don’t yet have a Transum subscription one can be very quickly set up if you are a teacher, tutor or parent.

Log in Sign up