# Math CH-2

 Prime Numbers only 1 and itself are the factors.hint:2,3,5,7,11,13,17,19,23,29,31,37,41 exp. 11x1=11 or 13x1=13 List all factors of #24 or Find all factors of 24 exp: 1x24 answer:1,2,3,4,6,8,12,242x12 are all factors of 243x84x6 COMPOSITE NUMBER has more than 2 factors.hint: 4,6,8,9,10,12,14... exp:2x2=4 or 5x2=10 Divisible by 2 if its last digit is 0,2,4,6,8 exp: 244 yes because its a 4 Divisible by 3 if the sum of all of its digits can be ÷ by 3.exp: 333 =9 yes because it equals to 9 Divisible by 4 if its las two digits can be ÷ by 4exp:644 =44 yes because its 44 (not sum) Divisible by 5 if its last digit is a 0 or 5exp. 025 yes because its a 5 Divisible by 6 if the sum of its digits is an even number and can be ÷ by 3.hint:2,4,6,8,10...exp:576=18 yes because 18 is even and is ÷ by 3 Divisible by 8 if its last 3 digits can be ÷ by 8.exp:5,088 =88 yes because it can be ÷ 8 Divisible by 9 if the sum of all digits can be ÷ by 9.exp: 207=9 yes becaus it can ÷ by 9 Divisible by 10. only if its last digits is a 0exp: 240 yes its a 0 at the end Find the prime factorization of 36 do the factorization tree and find primes.exp:36is 2.3.2.3 Finding the Greatest Common Factor (GCF): exp:18 and 24 find the ones that are same and (x)multiply.exp 18=2.3.3 =2.3=6 24=2.2.2.2.3 =2.3=6so the answer is 6 Equivalent fractors 1. 4 7x4=28 cross multiply7 28 1x28=28 EQUIVALENT Simplyfi (write in lowest term) "reduce" 6 =2x3 =3 cross out same and multiply8 2x2x2 =4 Multiply fractions multiply them horizontaly and find the prime factorizations and cross out same and multiply the ones that remain. Dividing franctions we change the reciprocals then we multiply and follow multiply directions how to simply one fraction. just find the prime factorization and cross out same and the answer is whats left. finding the GCF of fractions find the common ones and multiply them.56=2x2x2x7=878=2x2x2x3x3=8 so 8 is the GCF of 56 and 78 Mixed numbers exp 5 1/3we multiply 5 and 3 demoninator and + 1 and keep the 3 since is the demominator Authorigarcia280 ID71530 Card SetMath CH-2 Descriptionmath ch 2 review Updated2011-03-09T07:07:15Z Show Answers