Misc

Question 1

Mult. Trick. Factor out #s and pair 2,4,8 with

Answer 1

2x5=10, 4x25=100, 8x125=1000

Question 2

Prime #s < 100

Answer 2

2,3,5,7,11,13,17,19
23,29
31,37
41,43,47
53,59
61,67
71,73,79
83,89
97, 101

Question 3

Find all factors in a number

Answer 3

1. Prime Factorize (PF)
2. Add 1 to all exponents of PF
3. Multiply all exponents (+ 1) in #2

Question 4

A prime #’s cube will always have 4 positive divisors

Answer 4

n^0, n^1, n^2, n^3

Question 5

Relationship between |a+b| and |a| + |b|

Answer 5

|a+b| less or equal to |a| + |b|. They are equal when a and b have the same sign or a or b or both are 0

Question 6

Relationship between |a-b| and |a| - |b|

Answer 6

|a-b| greater or equal to |a| - |b|. They are equal when a and b have the same sign or b=0 and |a| > |b|