Rules of Divisibility Video Help
(Look at the "Divisibility Hints" Image at the top of this page for all the rules for divisibility!
(Look at the "Divisibility Hints" Image at the top of this page for all the rules for divisibility!


LEAST COMMON MULTIPLE: LCM AND GREATEST COMMON FACTOR: GCF
Key Points:
 MULTIPLES you get MULTIPLES when you MULTIPLY (Multiples are MANY) Multiples of 2 are 2, 4, 6, 8, 10...
 FACTORS FACTORS are in the FACTS (Factors are FEW) Factors of 12 are 1, 12, 2, 6, 3, 4




Division with Measurement
Key Points:
Key Points:
 In MEASUREMENT Division, the divisor names the size of the group (or unit) and the quotient represents the number of groups (or units).
 A Measurement Division problem can often be solved by thinking "How Many _________ are in ____________? "






Percents
Key Points:
Percent of a Quantity
Key Points:
Finding the Percent of a Number
Key Points:
Key Points:
 Percent= per hundred
 Percent= Part/Whole
Percent of a Quantity
Key Points:
 Percent= part/whole or Percent saved= amount saved/original price
 Percent paid= sale price/original price
Finding the Percent of a Number
Key Points:
 "of" is the same as multiplying!
 A percent is PER HUNDRED (example: 20% = 20/100)
 To make a whole number into a fraction, put a 1 under the whole number.
 To find 20% of 50 is the same as 20/100 x 50/1




Adding, Subtracting, Multiplying and Dividing Decimals
 When ADDING and SUBTRACTING DECIMALS Line up the decimals!!!
 When MULTIPLYING Decimals, order does not matter when listing them! Be sure to count the number of digits to the right of ALL the decimals and before placing your decimal into your answer.
 LOOK at your answer, does it make sense?


The Distributive Property
 The Distributive Property is easy to remember, if you recall that "multiplication distributes over addition". Formally, they write this property as "a(b + c) = ab + ac". In numbers, this means, for example, that 2(3 + 4) = 2×3 + 2×4.
Converting Decimals to Fractions

