Quant Flashcards
Divisible by 3
If the some of it’s digits is divisible by 3
Divisible by 4
If the integer is divisible by 2 twice Ex 28/2=14 14/2=7 for larger numbers check only the last two numbers
Divisible by 6
If divisible by both 2 and 3 ex 48 : 4+8= 12
Divisible by 8
If the integer is divisible by 2 three times and the last three digits are divisible by 8
Divisible by 9
The sum of the integers is divisible by 9
Sum of the digits x is equal to 21
You can infer that x is divisible by 3 but not by 9
Divisibility and addition/substraction
If you add or subtract multiples of N, the result is a multiple of N. If N is a divisor of x and y, then N is a divisor of X+Y
First 10 prime numbers
2 3 5 7 11 13 17 19 23 29
If a is a factor of B and B is a factor of c then a is a factor of c
3 x 2 = 6, 6 x 12 = 72
Divide 8 by a non-factor
5
Quotient
The number of times that the divisor goes into the dividend completely
OR
Add
AND
Multiply
3!
6
4!
24
5!
120
6!
720
Combination formula
n! / r(n-r)!
Different combinations of n taking r at the time. Order doesn’t matter (send 3 members out of 8 members to a conference club. How many different groups of representatives)
Semicolons
Should connect to complete sentences
A comma
Cannot connect two complete sentences (you need a conjunction, like and.)
Clause
Contains a subject and a working verb… who and what
The cat sitting by the stairs
Not a sentence
The cat was sitting by the stairs
Was is the working verb
Semicolon
Connects two independent sentences
Proportionality
Proportional: y is proportional to x, then y=kk where x is constant
Y is inversely proportional to x then y=k/x where k is constant (when y gets bigger, x gets smaller)
