math

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Table of Contents

• Algebra
• Area
• Fractions
• Decimals

Algebra

Basic ALgebra

• Its basically letters in an equation replacing a number in an equation 
• Or it could be a way to make one easier
• Example: 4x equals 16, x is 4 because that means 4 times x is equal to 16.
• You can also make equations.
• Example: 2y + 32 equals 56

Try some questions!!!

• 3x + 7a = 42. x + a = 10. x = ?
• 4x + 2a = 30. x + a =15. 9x + 4a= 60x. x=?

Harder Algebra

An easier way

• This is an easier way to do this kind  of algebra
• Ex: 9x - 2y= 30. 7x+2y=18
• So you add/subtract an equation from another.
• 9x-2y=30 7x+2y=18 16x=48, x=3, lets solve the first with this!
• 27-2y=30, 2y = negative two-thirds. 

Cont.

• negative two-thirds x two=negative 3.
• the minus cancels the negative 
• 27+3=30, lets solve the second now! 
• 7x3=21, 21+2y=18. We know that -3 makes the + into a -
• So 21-3=18!!!!!!

Area

Basic Area

• So, you all know how to calculate area right?
• But if you forgot, here's a review(Not really).
• Let's say that you have a 24 x 5 rectangle.  
• Just Multiply the 24 and the 5 and you have the area.

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Harder Area

• Let's say that each square on the last page with the triangle is 7 cm2 .
• For a triangle:
• If you want to find the area, do the lengths times height divided by 2.
• So lets say that it is 7cm2 and the length is 7cm then what is the height?
• Height can mean H, and the bottom can mean length, base, or B.

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The last slide(nope)

• The triangle on the last slide
• Lets say that its base is 5cm and the length is 4cm
• What is the area?
• It is 10cm2!

QUESTIONS AT THE END!!!!!!

Fractions

Multiplying

• We will learn how to multiply and divide Fractions.
• The denominator is what makes it a fraction 
• When you multiply a fraction with a whole number 
• it makes the numerator bigger or gets rid of the denominator
• example: two-thirds times 3 is 2 because 1-3rd times 3 is 1 .  Then 1 x 2.

Division

• So when you multiply it goes to the numerator
• When you divide, it goes to the denominator 
• For example: 2-5ths divided by 5 is 2-25ths 

REMEmber!

Decimals

multiplying

• This section shows you how to MULTIPLY!
• so all you practically do is multiply the numbers.
• for example: 3.89 x 5 is just simply 389 x 5 then add the decimal point.
• so it's 1945, then add the decimal point, 19.45.

Division

• Just like multiplying, you simply just divide.
• 24.6 divided by 12.
• Just 246 divided by 120. Which is 2.05

And we're done!!!!

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Any Questions?