Number Properties Flashcards
1
Q
Powers of 4
A
Odd - ends in 4
Even - ends in 6
2
Q
Powers of 3
A
1 = 3 2 = 9 3 = 7 4 = 1
3
Q
What is 0
A
Non negative
Non positive
Neither negative nor positive
Even
4
Q
Odd even properties
A
Odd * odd = Odd
Odd * Even or even * even = even
Mixed + or - = odd
Odd + odd or even + even = even
5
Q
Div by 4
A
Last 2 digits div by 4
6
Q
Div by 9
A
Sum of digits div by 9
7
Q
No of factors for integers
Odd
Even
A
Usually even
Odd if perfect square
8
Q
Consecutive integers
A
No of terms: (last - first / increment ) + 1
Sum - ave * # of terms
9
Q
Squaring numbers ending jn 5
75 squared
A
- N = number before 5
- N * n+ 1
- Add 25 in the end
Ex. 75 squared
- 7 * 8 = 56
5,625
10
Q
when will decimals terminate
A
If denominator consists of factors that are only 2s or only 5s or both 2s and 5s
11
Q
3 Consec integ
A
Multiple of 3
