61 Divisibility Rules

2, 3, 4, 5, 6, 9, 10 “Divisible BY” What does it mean? “Divisible by” means: If you divide one number by another, the result is a whole number WITHOUT a remainder Examples: 12 ÷ = No remainder 15 ÷ = No remainder Divisibility Rule A number is divisible by if the last digit is even (0, 2, 4, 6, 8) Examples: 78 3470 Review Even numbers: ghosteven Now You Try: 572 1464 Which number IS NOT divisible by 2? 249 Need More Practice: Numbers Divisible by WONDERFUL It ends in a 0, 2, 4, 6, or Divisibility Rule A number is divisible by three if the sum of the digits is divisible by Examples: 75 369 + = 12 12 ÷ = No Remainder +6 + = 18 18 ÷ = No Remainder Now You Try: 572 1464 Which number IS NOT divisible by 3? 279 Need More Practice: Numbers Divisible by The sum is divisible by Wonderful Divisibility Rule A number is divisible by when it is divisible by AND (prime numbers) Examples: 408 ends in an even number (2 rule) sum of the digits is divisible by Review prime and composite numbers: Prime and Composite Numbers Now You Try: Which number IS NOT divisible by 6? 8700 523 7602 Need more practice? Numbers Divisible by Way To Go!! This number is divisible by and Divisibility Rule A number is divisible by if the sum of the digits is divisible by Examples: 963 5445 + + = 18 18 ÷ = + + + =18 18 ÷ =2 Now You Try: Find the number that IS NOT divisible by 9873 636 Need More Practice: Numbers Divisible by and 10 5541 The sum of the digits is divisible by Great Job!!! Divisibility Rule 10 A number is divisible by 10 is it ends in a ZERO Example: 7630 ends in a zero 410 ends in a zero Now You Try: 56,920 7537 Find the number that IS NOT divisible by ten 870 The number ends in a ZERO Way To Go!! Congratulation s! Complete two of the three assignments You may complete them on your computers but print out your answer sheet Assignment 1.doc chart.doc assignment3.doc Now that you have completed your two assignments, feel free to go to the following sites THEY ARE SOOOOO MUCH FUN!!!!!! Fractions vectorkids -divisibility rules Gamequarium Division Games ... Divisible by WONDERFUL The last digits are divisible by Divisibility Rule 5A number is divisible by if the last digit is a or Examples: 615 ends in a 1480 ends on a Now You Try: Which number IS... divisible by 2? 249 Need More Practice: Numbers Divisible by WONDERFUL It ends in a 0, 2, 4, 6, or Divisibility Rule A number is divisible by three if the sum of the digits is divisible by Examples:... divisible by 3? 279 Need More Practice: Numbers Divisible by The sum is divisible by WONDERFUL Divisibility Rule A number is divisible by if the last two digits are divisible by Examples: 1320