Numbers and operations Flashcards
What are Natural Number’s and their Scientific notation? Can they be expressed as a fraction?
1,2,3,4,5…
(N)
Natural Numbers can be expressed as a fraction
What are Whole Number’s and their Scientific notation?
Can they be expressed as a fraction?
0,1,2,3,4,5…
(W)
Whole Numbers can be expressed as a fraction
What are Integer’s and their Scientific notation?
Can they be expressed as a fraction?
…-3,-2,-1,0,1,2,3…
(Z)
Integers can be expressed as a fraction
What are Rational Number’s and their Scientific notation?
Can they be expressed as a fraction?
…..1/3,-2/1/2,2,0,-22,7/16….
(Q)
Rational Numbers can be expressed as a fraction
What are Irrational Number’s and their Scientific notation?
Can they be expressed as a fraction?
pie, square root of 2
(R-Q)
Irrational numbers cannot be expressed as a fraction
What are Real Number’s and their Scientific Notation?
Can they be expressed as a fraction?
Real Numbers are N+W+Z+Q+R-Q
(R)
All but R-Q can be expressed as fractions.
What is a IDENTITY NUMBER
An identity Number is the number which you need to execute an operation which does not change the original value. i.e. 100*1=100
What is the identity number for Additions?
0
What is the identity number for Multiplications?
1
What is the opposite of 3?
-3
What is the opposite of -7
7
Express the opposite of 1 in an operation
1+-2=-1
What is an important principle when it comes to multiple operations for subtractions and Multiplications?
An important principle to remember is that an equal amount of operators or lines equals a positive operation. An unequal amount of lines or operators equals a negative operation. i.e. - - -2=-2 // - - - -2=2
What are signed numbers
Signed numbers are either positive[+2] or negative[-2] the + and- are the signs ergo signed numbers.
Is the result negative or positive? (-3)(-3)(-3)?
Negative
Is the result negative or positive? (-3)(-3)(-3)*(-3)?
Positive
Is the result negative or positive? (-3)*(-3)?
Positive
Is the result negative or positive? (-3)*(+3)?
Negative
Is the result negative or positive? (+3)*(+3)
Positive
Name the principle you know for solving a multiplication with 2 signed numbers
If we have an even amount of signs it is positive, if we have an uneven amount of signs it is negative. (++=+ // --=+ // -*+= -)
Name the principle you know for solving a multiplication with more than 2 signed numbers.
I we have an even amount of negative signs the result is positive, of we have an odd amount of negative signs the result is negative.
Name the rule for dividing signed numbers
When dividing signed numbers it is best to remember that if you have an overall amount of even negative signs in the division the result is positive. If you have an overall amount of odd negatively signed numbers the result is negative.
-3/3=?
-1
3/-3=?
-1
3/3=?
1
-3/-3=?
1
(-3)*(-2)/6=?
1
(3)*(-2)/6=?
-1
(-3)*(-2)/-6=?
-1
What is the result if you add two negative numbers
Negative
What is the result if you add two positive numbers
Positive
What is the result if you add/subtract two opposite signed numbers
Depending on which signed number is larger this will be the sign of the result
What is Absolute value?
Absolute Value is the numeric amount from ORIGIN to finish
How can you tell a number is an Absolute Value?
If the number is written inside these brackets |x|
If you simplify an Absolute value expression is the result automatically positive?
Yes it does not matter if the Value inside the Absolute value brackets is signed negative or positive the result after removing the brackets is always positive.
Is there any circumstance after simplifying the Absolute value of something that we have a negative result?
Yes, if we put a negative sign BEFORE the Absolute Value brackets we carry this over to the result i.e. -|2|=-2
|2-3|=?
|-1|=1
|2+4+1|=?
|7|=7
- |2-3|=?
- |-1|=-1
- |2+1|=?
- |3|=-3
