873 Math Blog

This video is about the Child Labour.

Adding And Subtracting Fractions

• Find the Common denominator
• Add the numerator

• Always the same denominator
• Subtract numerator

Multiplying Fractions

• multiply the numerators
• multiply the denominators

• change mixed fractions to an improper
• multiply the numerators and denominators

Dividing Fractions

• Find the reciprocal.

• Multiply the numerator to a numerator.

• Multiply the denominator to a denominator.

• Convert the fraction into a mixed fraction.

• Simplify it.

Word Problem

Question:

6) One week, Kristi worked 3 days at department store for 31/2h each day.
She was paid $9/h.

a) How many hours did Kristi work that week? Show your thinking.


















b) How much did Kristi earn that week?


















7) Jupiter completes about 2 2/5 rotations every 24 hours (an Earth day). How many rotations does Jupiter complete in one Earth week? Show your thinking.

















8) A sailboat is sailing at 8 1/2 km/h. If the weather conditions and the current do not change, how far will the sailboat travel in 1 1/3h? Show your thinking.

Pythagoras

Pythagoras was a Greek mathematician. He was the first vegetarian. He proved
the Pythagorean Theorem. He is known as "the father of numbers".




This triangle is Right Angled or R.A.T. The letter "A and B" are called legs.
And the letter "C" is called Hypotenuse.




This Square is quadrilaterals. All side of square are equals 90 degrees.



I showing you 2 example of theorem.
Here is the first example of Pythagoras Theorem.



a^2+b^2=c^2
a^2+8^2=10^2
-8^2 -8^2
a^2=10^2-8^2
a^2=100-64
a^2=36
a=6
a+a=|----|
6+6=12mm


Here is the second example of Pythagoras Theorem.






a=225cm
a=225
a=16
length and width is 15.
The perimeter of the central square is 60.
Means A and B is equal to 15.
a^2+b^2=c^2
15^2+15^2=c^2
(15x15)+(15x15)=c^2
225+225=c^2
450=c^2
21.21=c^2
P=21.21+15+15
P=51.21
Perimeter of each triangle is 51.21

P=60+51.21(4)
P=60+204.84
P=264.84
The perimeter of board is 264.84.

Pythagoras


Today class are doing some Pythagoras.
The first Pythagoras is the Right Triangle.


Right Triangle

• the 2 legs are make the 90 degrees angle.

• theta + beta = 90 degrees.

• Hypotenuse was the longest side of right triangle.

SQUARES

Today in class, watch a movie about Additive Equation and Subtractive Equation.
Then Mr. Harbeck answering the question from homework yesterday by using the Algebra tiles for Additive and Subtractive Equation.Mr.Harbeck give some assignment about the Algebra Equation solving.

Right now disscused the part of Algebra Equation Solving like a Additive Equation.

Here are some Example for Additive Equation:












After disscused the Additive Equation now is Subtractive Equation. The subtractive Equation is the same step of the Additive Equation.


Here are some example of Subtractive Equation:












Sorry for the mistakes!!!
For the next Scribe I pick Gerico Lacap.

Adding Integers

Adding Integers
Add,combined
Increased,Plus,total
Adding Integers is fun
Increased


Subtracting Integers

Subtracting Integers
Some negative Integers is Positive
Change the negative to positive

Quotative Division

Quotative Division is like a addition
Only use the same sign
Any numbers you use


Partative Division

Partative Division
Is like giving something
Its a give each person

Chapter 2

Combining like terms and Distributive Property

Mean

• the sum of a set of values divided by the number of values in the set
  

Median

• the middle number in a set of data ofter the have been order for the data
  

Mode

• the most fire guently occuring number in a set of data .
• there can be than one mode
  

Range

• the positive differnce between the largest and the smallest values in a data set

Here is a great video explaining Mean,Median,Mode