Editing Divisibility rule (section)

===Divisibility by 5===
Divisibility by 5 is easily determined by checking the last digit in the number (47'''5'''), and seeing if it is either 0 or 5.  If the last number is either 0 or 5, the entire number is divisible by 5.<ref name="Pascal's-criterion"/><ref name="last-m-digits"/>

If the last digit in the number is 0, then the result will be the remaining digits multiplied by 2.  For example, the number 40 ends in a zero, so take the remaining digits (4) and multiply that by two (4 × 2 = 8).  The result is the same as the result of 40 divided by 5(40/5 = 8).

If the last digit in the number is 5, then the result will be the remaining digits multiplied by two, plus one.  For example, the number 125 ends in a 5, so take the remaining digits (12), multiply them by two (12 × 2 = 24), then add one (24 + 1 = 25).  The result is the same as the result of 125 divided by 5 (125/5=25).

'''Example.'''<br>
''' If the last digit is 0'''
# 110 (The original number)
# <s>11</s> <u>0</u> (Take the last digit of the number, and check if it is 0 or 5)
# <u>11</u> <s>0</s> (If it is 0, take the remaining digits, discarding the last)
# 11 × 2 = 22 (Multiply the result by 2)
# 110 ÷ 5 = 22 (The result is the same as the original number divided by 5)

'''If the last digit is 5'''
# 85 (The original number)
# <s>8</s> <u>5</u> (Take the last digit of the number, and check if it is 0 or 5)
# <u>8</u> <s>5</s> (If it is 5, take the remaining digits, discarding the last)
# 8 × 2 = 16 (Multiply the result by 2)
# 16 + 1 = 17 (Add 1 to the result)
# 85 ÷ 5 = 17 (The result is the same as the original number divided by 5)