# Decimal Plus

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

##### Level 1Level 2Level 3Level 4DescriptionHelpMore 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, 3.6 metres long, and one coach, 5.4 metres long. How long is the train altogether?

Working:

m
Judy has to travel 4.9 kilometers to get to her school. She has a lift in her auntie's car for 3.7 kilometres then walks the rest of the way. How far does she walk?

Working:

km
A candle is 8.2cm tall when new. One evening it burns down 4.4cm. 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?

9.4cm
10.7cm
11.9cm

Working:

cm
What is the difference between 9.57 and 3.81?

Working:

What is the sum of 9.22, 3.85 and 65.4?

Working:

Add 76.3 to 62.3 and then subtract 4?

Working:

What change would you get from £10 if you spent £9.91? Give your answer in pence

Working:

p
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?

{66, 6.6, 6.06, 6.66, 6.606}

Working:

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

 12.4 9.3 24.8 27.9 15.5 3.1 6.2 21.7 ?

What is the missing number?

Working:

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.

## 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.

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Move the pieces of the tower from one place to another in the minimum number of moves. This puzzle was invented in 1883 but is still as captivating today as it was all those years ago.

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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:

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## Description of Levels

Close

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.