Divisibility Rules
A number is divisible by 2 if its last digit is odd.
EVEN
81 =
34
GCF OF 24 and 30
GCF: 2 X 3 = 6
5 12/13 + 2 1/13
7 13/13 or 8
5/3 x 9/15
45/45 or 1
A number is divisible by 6 if it is divisible by both 2 and 3.
TRUE
50 =
2 x 52
GCF OF 18 and 36
GCF: 2 x 3 x 3 = 18
10/12 - 6/12
4/12 or 1/3
8/10 x 5/6
40/60 or 2/3
A number is divisible by 5 if its first digit is 0 or 5.
last
100
22 x 52
LCM of 15 and 25
LCM = 75
1/4 + 7/10 =
19/20
7/13 ÷ 4/3 =
21/52
A number is divisible by 3 if the difference of its digits is divisible by 3.
sum
250 =
2 x 53
LCM of 15 and 50
LCM: 150
1/3 + 1/8 =
11/24
12/15 ÷ 4/3 =
36/60 or 3/5
A number is divisible by 4 if the first three digits form a number that is divisible by 4.
last two
1,500 =
22 x 3 x 53
GCF and LCM of 18 and 72
GCF : 2 x 3 x 3 = 18
LCM : 2 x 2 x 2 x 3 x 3 = 72
7/11 - 2/8 =
17/44
25/30 ÷ 3/5 =
125/90 or 25/18