STAAR Review Key Concepts (fractions, decimals, prime/composite)

add or subtract fractions w/ different denominators

find the LCD

multiply fractions

multiply straight across

divide fractions

Keep Change Flip

start with a fraction (dividing fractions)

end with a fraction

start with a whole # (dividing fractions)

end with a whole #

make a whole # a fraction

put it over 1

first four prime numbers

2...3...5...7

prime number

exactly two factors (1 and me)

divisible by 2

even # (ends w/ 0...2...4...6...8)

divisible by 5

ends with a 5 or a 0

divisible by 3

add digits and sum can be divided by 3

divisible by 4

double and half

divisible by 6

divisible by 2 and 3

divisible by 8

divisible by 2 and 4

composite number

3 or more factors

add/subtract decimals

button your shirt (line up decimals)

divide decimal by whole number

raise decimal to the roof

¼

0.25

½

0.5

¾

0.75