# 1.4 Scr0340: arithmetic operators in scratch 2.0

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The purpose of this module is to teach you about operators and operands in general and arithmetic operators in particular. You will also learn about expressions and statements, and you will learn how to write a Scratch program that illustrates the use of arithmetic operators in Scratch.

## Preface

Scratch 2.0 (released May 9, 2013) is the second major version of Scratch to be released during the life of theproduct. Among other things, it features a redesigned editor and website, and allows you to edit projects directly from your web browser.

This module is one in a collection of modules designed to help beginners of all ages (8 and up) learn how to create the code for computer programs using Scratch 2.0 . Information is provided not only for the beginners themselves but also for their parents and teachers where appropriate.

The purpose of this module is to teach you about operators and operands in general and arithmetic operators in particular. You will also learn about expressions and statements, and you will learn how to write a Scratch program that illustrates the use of arithmetic operators in Scratch.

I will also provide the specifications for a student-programming project for you to complete in order to demonstrate your understanding of what you learnedfrom the first program.

## Viewing tip

I recommend that you open another copy of this module in a separate browser window and use the following links to easily find and view the images while you are reading about them.

## Images

• Image 1 . Reduced screen shot of Arithmetic01 programming interface.
• Image 2 . Expanded view of the rightmost panel.
• Image 3 . Preparing to use the arithmetic operators.
• Image 4 . Result of dropping addition and subtraction operators into variable blocks.
• Image 5 . Stage area of the finished program.
• Image 6 . Making the button say ouch.
• Image 7 . Output from student project program named Arithmetic02.

## Operators

Operators are the action elements of a computer program. They perform actions such as adding two variables, dividing one variable by another variable,comparing one variable to another variable, etc.

do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
absolutely yes
Daniel
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it is a goid question and i want to know the answer as well
Maciej
Abigail
Do somebody tell me a best nano engineering book for beginners?
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s.
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Tarell
what is the actual application of fullerenes nowadays?
Damian
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Tarell
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Virgil
is Bucky paper clear?
CYNTHIA
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Harper
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s.
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or in general
Ebrahim
in general
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tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
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China
Cied
types of nano material
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many many of nanotubes
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Yasmin
what is the function of carbon nanotubes?
Cesar
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Uday
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preparation of nanomaterial
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what is system testing
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Stotaw
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silver nanoparticles could handle the job?
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not now but maybe in future only AgNP maybe any other nanomaterials
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I'm interested in Nanotube
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this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
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how did you get the value of 2000N.What calculations are needed to arrive at it
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