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Divisibility and Factors. 4.1. Divisibility Rules of 2 and 4. A number is divisible by 2 if the last digit if divisible by 2 A number is divisible by 4 if the last two digits are divisible by 4. Divisibility Rules of 3 and 9.
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Divisibility Rules of 2 and 4 • A number is divisible by 2 if the last digit if divisible by 2 • A number is divisible by 4 if the last two digits are divisible by 4
Divisibility Rules of 3 and 9 • A number is divisible by 3 is the sum of the digits are divisible by 3 • A number is divisible by 9 if the sum of a the digits are divisible by 9
Divisibility of 5 and 10 • If a number ends in a 5 or 0 its divisible by 5 • If a number ends in a 0 its divisible by 10
Divisibility of 6 • If it ends in an even number and if the sum of the digits is divisible by 3.
Examples: 1.) Is 160 divisible by 5 2.) is 56 divisible by 10 3.) is 53 divisible by 2 4.) is 1118 divisible by 2 5.) is 64 divisible by 9 6.) is 472 divisible by 3 7.) Is 174 divisible by 3 8.)Is 43, 542 divisible by 9
Factor • A number that will divide with out a remainder into another
List the positive factors of each number • 10 • 21 • 24 • 31
What are possible arrangements if there are 36 students singing at a concert. There must be at least 5 students in each row and the same number of students in each row.
Homework TB Pg 174 (2-52) even
