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Divisibility Rules

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by

Alicia Wilson

on 30 December 2013

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Transcript of Divisibility Rules

Divisibility Rules 32, 16, 100, 20568 are all divisible by 2! If the number ends in 2, 4, 6, 8, or 0 A number is divisible by 2 List 3 numbers that are divisible by 2. To decide if a number is divisible by 3 51 Add all the digits up, if the sum is divisible by 3, so is the number. 5+1=6, 6 is divisible by 3, so is 51! 621 6+2+1=9, 9 is divisible by 3, so is 621! Give 3 examples of 3 numbers divisible by 3. The number is divisible by 4 if.... 520 The last 2 digits are divisible by 4 20 is divisible by 4, so is 520! 2316 16 is divisible by 4, so is 2316! Give an example of a 5 digit number divisible by 4. Divisibilty by 5, iff 225 ends in 5, so it is divisible by 5
2010 ends in 0, so it is divisible by 5 The number ends in a 5 or 0 Give 5 examples of numbers divisible by 5 A number is divisible by 6 when 822 ends in 2 so is divisible by 2,
8+2+2=12, 12 is divisible by 3 so...822 is divisible by 6!

96 ends in 2, so is divisible by 2
9+6=15, 15 is divisible by 3, so 96 is divisible by 6! The number is divisible by 2 AND 3 Tell me a 3 digit number that is divisible by 6 If a number is divisible by 9 189, 1+8+9=18, 19 is divisible by 9, so is 189

54162, 5+4+1+6+2=18, 18 is divisible by 9, so is 54162 The sum of the digits is divisible by 9 Write 2 numbers that are divisible by 9 20, 100, 5000, 10000000 all end in 0, so all are divisible by 10! A number is divisible by 10, if it ends in 0 Divisibility by 10 Give me 2 examples of numbers divisible by 10 Here is your bag of divisibility tricks. Whenever you need to find common multiples, reduce fractions, or common denominators, always remember your bag of tricks. Want to make math easier? Just follow the rules!
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