# Decimal Plus

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

##### Level 1Level 2Level 3DescriptionHelpMore Decimals

This is level 3; 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, 3.9 metres long, and one coach, 5.4 metres long. How long is the train altogether?

Working:

m
Judy has to travel 4.6 kilometers to get to her school. She has a lift in her auntie's car for 3.4 kilometres then walks the rest of the way. How far does she walk?

Working:

km
A candle is 8.5cm tall when new. One evening it burns down 4.1cm. How tall is it now?

Working:

cm
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?

7.5cm
8.3cm
8.6cm

Working:

cm
What is the difference between 6.09 and 2.36?

Working:

What is the sum of 9.23, 3.63 and 90.9?

Working:

Add 63.6 to 72.8 and then subtract 3.33?

Working:

What change would you get from £10 if you spent £9.76? Give your answer in pence

Working:

p
The range of a set of numbers is found by subtractingh the smallest number from the largest. What is the range of the following set of numbers?

{99, 9.9, 9.09, 9.99, 9.909}

Working:

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

 20.4 15.3 40.8 45.9 25.5 5.1 10.2 35.7 ?

What is the missing number?

Working:

Check

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

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.

## Transum.org

This web site contains over a thousand free mathematical activities for teachers and pupils. Click here to go to the main page which links to all of the resources available.

Please contact me if you have any suggestions or questions.

## More Activities:

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 3 October 'Starter of the Day' page by Fiona Bray, Cams Hill School:

"This is an excellent website. We all often use the starters as the pupils come in the door and get settled as we take the register."

Comment recorded on the 18 September 'Starter of the Day' page by Mrs. Peacock, Downe House School and Kennet School:

"My year 8's absolutely loved the "Separated Twins" starter. I set it as an optional piece of work for my year 11's over a weekend and one girl came up with 3 independant solutions."

#### Without Lifting

Can you draw these diagrams without lifting your pencil from the paper? This is an interactive version of the traditional puzzle. Some diagrams are possible while others are not. What is the rule?

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.

A Transum subscription unlocks the answers to the online exercises, quizzes and puzzles. It also provides the teacher with access to quality external links on each of the Transum Topic pages and the facility to add to the collection themselves.

Subscribers can manage class lists, lesson plans and assessment data in the Class Admin application and have access to reports of the Transum Trophies earned by class members.

If you would like to enjoy ad-free access to the thousands of Transum resources, receive our monthly newsletter, unlock the printable worksheets and see our Maths Lesson Finishers then sign up for a subscription now:

Subscribe

## 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:

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.

For Students:

For All:

## Description of Levels

Close

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

Level 2 - Adding and subtracting a wide range of decimal numbers

Level 3 - 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.

## Adding and Subtracting Decimals

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

Close