Divisible by 2:
A number is divisible by 2 if the last digit is even i.e. 0, 2, 4, 6, or 8.
Example:
138 is divisible by 2 because the last digit, 8, is even.
249 is not divisible by 2 because the last digit, 9, is not even.
Divisible by 3:
A number is divisible by 3 if the sum of the digits is divisible by 3.
372 is divisible by 3 because 3+7+2 = 12 and 12 ÷ 3 = 4.
218 is not divisible by 3 because 2+1+8 = 11 and 11 ÷ 3 = 3 2/3.
Divisible by 4:
A number is divisible by 4 if the last two digits are divisible by 4.
312 is divisible by 4 because 12 ÷ 4 = 3.
334 is not divisible by 4 because 34 &divide 4 = 8 1/2.
Divisible by 5:
A number is divisible by 5 if the digit is 0 or 5.
325 is divisible by 5 because the last digit is 5.
314 is not divisible by 5 because the last digit is, 4, is not 0 or 5.
Divisible by 6:
A number is divisible by 6 if it is even and is divisible by 3.
228 is divisible by 6 because it is even and 2+2+8 = 12 and 12 ÷ 3 = 4.
314 is not divisible by 6 because 3+1+4 = 8 and 8 ÷ 3 = 2 2/3.
Divisible by 7:
Double the last digit and subtract it from a number made by the other digits.
The result must be divisible by 7.
364 is divisible by 7 because double 4 is 8, 36 - 8 = 18, and 28 ÷ 7 = 4.
213 is not divisible by 7 because double 3 is 6, 21 - 6 = 15 and 15 ÷ 7 = 2
1/7.
Divisible by 8:
A number is divisible by 8 if the last three digits are divisible by 8.
11816 is divisible by 8 because 816 ÷ 8 = 102.
32113 is not divisible by 8 because 113 ÷ 8 = 14 1/8.
Divisible by 9:
A number is divisible by 9 if the sum of the digits is divisible by 9.
1107 is divisible by 9 because 1+1+0+7 = 9 and 9 ÷ 9 = 1.
2317 is not divisible by 9 because 2+3+1+7 = 13 ÷ 9 = 1 4/9.
Divisible by 10:
A number is divisible by 10 if the number ends in 0.
9870 is divisible by 10 because it ends with 0.
7102 is not divisible by 10 because it does not end with 0.
Divisible by 11:
Add and subtract the digits in an alternating pattern. Then check if the answer is
divisible by 11.
2563 is divisible by 11 because 2-5+6-3 = 0.
7213 is not divisible by 11 because 7-2+1-3= 3.