Download Review for Quiz

Review for Quiz
 Know how to use your divisibility rules, especially 2, 3, 4, 5, 9, 10.
Review your rule sheet.
Example: 310 2: yes (even) 3: no (digits add to 4)
4: no (last 2 digits form 10)
5: yes (last digit is a 0) 9: no (digits add to 4)
10: yes (ends in zero)
 Be able to list all the factors of a number.
Example: 36 1, 2, 3, 4, 6, 9, 12, 18, 36
 Know prime and composite definitions. They should be in your
spiral. Be able to tell whether a number is prime or composite.
Use your sieve for 1-100.
Examples 43 is prime because its only factors are 1 and 43
70 is composite because 1, 2, 5, 7, 10, 14, 35, 70 are
all factors…it has more than 2 factors
 Be able to write the prime factorization of a number using a factor
tree.
225
5 • 45
5 •
5
•
5 •
9
5 • 3 • 3
3² • 5²
Find the Greatest Common Factor either by listing out factors or
using prime factorization.
Find the GCF of 24 and 36
24: 1, 2, 3, 4, 6, 8, 12, 24
36: 1, 2, 3, 4, 6, 9, 12, 18, 36
GCF = 12
24
3• 8
3• 2• 2• 2
2³ • 3
36
3 • 12
3 •2• 6
3 • 2 •2 •3
2² • 3²
GCF= 2 • 2 • 3 = 12
Find equivalent fractions by multiplying or dividing the numerator and
the denominator by the same common factor. Simplify a fraction by
dividing by the GCF or a common factor until the only common factor
is 1.
10 ÷ 5 = 2
35 ÷ 5 = 7
10/35 is equivalent to 2/7
2/7 is the simplified form
3 • 4 = 12
5 • 4 = 20
3/5 is equivalent to 12/20.
Solve for the missing variable.
12 = x
21 = 7 x = 4 divide the numerator and denominator by 3