Introduction to Algebra Online - 26/7

Introduction to Algebra Online - 26/7

Introduction to why we use Algebra and some key terms used in Algebra.

Why do we Alge - bra?

• Sometimes we need to work things out that has numbers that can change or are unknown

• Allows us to perform calulations and work things out when we don't have all of the information yet

• Can be used to design structures, make calculations quicker, coding, data analysis, coaching etc.

What is Algebra?

• Algebra is the art of using letters in place of a number that can change or that we don't know yet

• The letters are like an empty box, they save the place for a number until we know what it is

Fancy Language

• In Algebra there are some fancy words used

• Some of these words are used in normal circumstances so will look familiar

• In Algebra they have different meanings

Multiple Choice

Why do we use Algebra?

• To be annoying silly math people

• Sometimes we have a number that can change or that we don't know yet

• Because the digits 0 through to 9 weren't enough

• Mathematicians got jealous of the alphabet

Algebra Glossary Words

Fancy words and their meaning in Algebra

Variable

Something that can change or that is an unknown.

Represented by a pronumeral/letter

Pronumeral

Fancy language for letter. It means letter used in Maths.

Used to represent a number(s) that isn't known yet

Term

• A term is actually almost anything in a Math sentence

• It is a number or a letter or a combination of letters and numbers

Coefficient

• Is the number section of a term that has a number and letter combination

• In this example the 5 in front of the x is the coefficient

Constant

• Is a number in a Maths sentence

• Called a constant as it's value never changes

• In the example 7 and  $\sqrt{2}$  will always be those values and not change, so are called constants

Expression

• An expression is a combination of terms and operations

• Operations are  $+\ \ -\ \ \times\ \ \div\ \ ^2\ \ \sqrt{ }$  etc.

Equation

An equation is any number of terms that have an = in between them.

No = means no equation.

Multiple Choice

A term is

• something involving an equals sign

• subtraction only

• a number or letter or a combination

• a period of time (around 10 weeks) that you must go to school for before holidays

Multiple Choice

An expression involves an = sign

• True

• False

Fill in the Blank

A co-efficient is the ____________ at the front of the letters in a term

Multiple Choice

A pronumeral is a

• Professional number that regularly updates videos of it's glory on twitch

• A number with a value higher than 10000

• A number used in business to describe profit

• A letter used to represent an unknown or changeable number

Multiple Choice

A variable is something

• that can change

• that decides your future

• that orchestrates a plot twist

• related to an aerial

Multiple Choice

What must every equation have to be classified as an equation

• +

• =

• -

• $\div$