Real Numbers

Question 1

• Natural Numbers: 1,2,3,4
• Whole Numbers: Natural Numbers + 0
  Integers: Whole Numbers + negative numbers
  Rational Numbers: integers + can be written as a fraction. 4/1, 3/4…
  Irrational Numbers: Squareroot of a number, Pi …

Answer 1

v

Question 2

How to notate if you want the opposite of 3?

Answer 2

-(3)

Question 3

What is the absolute value of 5 and -5?

How to notate an absolute value?

Answer 3

5. The absolute value is the distance of the number to zero.

Its always positive, direction doesn´t matter, only strecke.

|5|=5

Question 4

Expanded form means it is written out. What is the expanded form of 7x**2?

And (6x)**4

Answer 4

7xx. Why? If no exponent is written, it means that the exponent is one.

(6x)(6x)(6x)(6x)

Question 5

What is the Squareroot of 9?

What is sr of 4/81?

Answer 5

It´s 3. The squareroot asks, what have you a pair of under me. What number multiplied with itself results in me?

Can be written as sr4/sr81 = sr22/sr99= 2/9

Question 6

What is the Commutative Property of Addition/Multiplication?

Answer 6

a+b=b+a
798=897
order doesn´t matter

Question 7

What is the Associative Property of Addition/Multiplication?

Answer 7

(a+b)+g=a+(b+g)
7(98)=(89)7
grouping doesn´t matter

Question 8

What is 7(c+9) without parentheses?

Answer 8

7c+63

Question 9

PEMDAS?

What is 5+12/2*6-1

Answer 9

acronym and bc add/subt and mult/div have same stance, always from left to right.

If several P or Brackets, work from inside to outside

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