Transum Software

Decimal Plus

Practise mental and written methods for adding and subtracting decimal numbers.

Level 1 Level 2 Level 3 Level 4 Description Help More Decimals

This is level 4; Real life problems involving the addition and subtraction of decimal numbers. You can earn a trophy if you get at least 7 questions correct.

At an amusement park a minature train consists of an engine, 3.3 metres long, and one coach, 5.7 metres long. How long is the train altogether?

Working:

mCorrect Wrong
Judy has to travel 4.7 kilometers to get to her school. She has a lift in her auntie's car for 3.5 kilometres then walks the rest of the way. How far does she walk?

Working:

kmCorrect Wrong
A candle is 8.2cm tall when new. One evening it burns down 4.5cm. How tall is it now?

Working:

cmCorrect Wrong
Three toy building blocks are placed end to end. What is the total length of the line of three blocks if their lengths are as shown in the following diagram?

9.5cm
10.3cm
11.8cm

Working:

cmCorrect Wrong
What is the difference between 6.85 and 4.74?

Working:

Correct Wrong
What is the sum of 5.89, 2.16 and 66.4?

Working:

Correct Wrong
Add 91.3 to 49.7 and then subtract 3.11?

Working:

Correct Wrong
What change would you get from £10 if you spent £9.39? Give your answer in pence

Working:

pCorrect Wrong
The range of a set of numbers is found by subtracting the smallest number from the largest. What is the range of the following set of numbers?

{55, 5.5, 5.05, 5.55, 5.505}

Working:

Correct Wrong
This is a magic square. The sum of each row, column and diagonal of three numbers is the same.

12.49.324.8
27.915.53.1
6.221.7?

What is the missing number?

Working:

Correct Wrong
Check

This is Decimal Plus level 4. You can also try:
Level 1 Level 2 Level 3

There is also an exercise on multiplication and division of decimals called Decimal Times.

Instructions

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 14 September 'Starter of the Day' page by Trish Bailey, Kingstone School:

"This is a great memory aid which could be used for formulae or key facts etc - in any subject area. The PICTURE is such an aid to remembering where each number or group of numbers is - my pupils love it!
Thanks"

Comment recorded on the 1 August 'Starter of the Day' page by Peter Wright, St Joseph's College:

"Love using the Starter of the Day activities to get the students into Maths mode at the beginning of a lesson. Lots of interesting discussions and questions have arisen out of the activities.
Thanks for such a great resource!"

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Featured Activity

Nine Digits

Nine Digits

Arrange the given digits one to nine to make three numbers such that two of them add up to the third. This is a great puzzle for practicing standard pen and paper methods of three digit number addition and subtraction.

Answers

There are answers to this exercise but they are available in this space to teachers, tutors and parents who have logged in to their Transum subscription on this computer.

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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.

Teachers

If you found this activity useful don't forget to record it in your scheme of work or learning management system. The short URL, ready to be copied and pasted, is as follows:

Alternatively, if you use Google Classroom, all you have to do is click on the green icon below in order to add this activity to one of your classes.

It may be worth remembering that if Transum.org should go offline for whatever reason, there is a mirror site at Transum.info that contains most of the resources that are available here on Transum.org.

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

Do you have any comments? It is always useful to receive feedback and helps make this free resource even more useful for those learning Mathematics anywhere in the world. Click here to enter your comments.

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Description of Levels

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Level 1 - Adding and subtracting numbers less than ten with one decimal place

Level 2 - Adding and subtracting numbers less than one hundred with two decimal places

Level 3 - Adding and subtracting decimal numbers with a different number of decimal places

Level 4 - Real life problems involving the addition and subtraction of decimal numbers

There is also an exercise on multiplication and division of decimals called Decimal Times.

Finally there's the Decimals topic page which includes 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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Adding and Subtracting Decimals

This video will teach you how to perform the basic operations with decimals.

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

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