# 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, 3.8 metres long, and one coach, 5.4 metres long. How long is the train altogether?

Working:

m
Judy has to travel 4.4 kilometers to get to her school. She has a lift in her auntie's car for 3.2 kilometres then walks the rest of the way. How far does she walk?

Working:

km
A candle is 8.8cm tall when new. One evening it burns down 4.3cm. 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?

7.7cm
8.3cm
8.5cm

Working:

cm
What is the difference between 8.46 and 5.05?

Working:

What is the sum of 7.32, 4.14 and 17?

Working:

Add 61.2 to 55.3 and then subtract 1.85?

Working:

What change would you get from £10 if you spent £9.52? 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?

{33, 3.3, 3.03, 3.33, 3.303}

Working:

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

 16.4 12.3 32.8 36.9 20.5 4.1 8.2 28.7 ?

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 19 June 'Starter of the Day' page by Nikki Jordan, Braunton School, Devon:

"Excellent. Thank you very much for a fabulous set of starters. I use the 'weekenders' if the daily ones are not quite what I want. Brilliant and much appreciated."

Comment recorded on the 19 November 'Starter of the Day' page by Lesley Sewell, Ysgol Aberconwy, Wales:

"A Maths colleague introduced me to your web site and I love to use it. The questions are so varied I can use them with all of my classes, I even let year 13 have a go at some of them. I like being able to access the whole month so I can use favourites with classes I see at different times of the week. Thanks."

#### Four Colour Theorem

This mathematical activity involves colouring in! That makes a change. Using the paint bucket tool can you flood fill the regions so that no two adjacent regions are the same colour?

## Answers

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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:

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 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.

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