Module 5 Review!

Module 5 Review!

Fractions

• We can show fractions using number lines or area models.

• On a number line, remember to count then number of tick marks (NOT INCLUDING ZERO) to find the number of equal parts.

• An area model shows a picture (usually a shape) split into the number of parts (denominator). The shaded parts shows the numerator.

• We can find equivalent fractions by comparing models with the same value but different parts.

Multiple Choice

What fractional parts is this number line divided into?

• fourths

• sixths

• halves

• fifths

Multiple Choice

What equivalent fractions are shown in these models?

• 3/3 and 6/6

• 1/2 and 2/3

• 2/3 and 4/6

• 2/3 and 4/3

Least Common Multiple

• Multiple: the product of multiplying 2 numbers together

• Think about skip counting, multiples of 2: 2, 4, 6, 8, 12, 14...

• LCM: Least Common Multiple: Smallest multiple 2 numbers have in common

• To find: list the multiples for both numbers until you find one in common! Circle the smallest one. This is the LCM!

Multiple Choice

What is the least common multiple for 2 and 5?

• 5

• 25

• 10

• 20

Multiple Choice

What is the least common multiple for 4 and 6?

• 24

• 16

• 18

• 12

Greatest Common Factor

• Factor: numbers that multiply together to make another number (2 and 3 are factors of 6)

• Greatest common factor: the biggest factor that 2 numbers have in common.

• To find GCF: list all the factor pairs for each number (think about multiplying each number by 1, then, 2, then 3, then 4...)

• Circle any they have in common. Choose the greatest one.

Multiple Choice

What is the greatest common factor for 15 and 20?

• 25

• 5

• 15

• 30

Multiple Choice

What is the greatest common factor for 16 and 20?

• 4

• 80

• 2

• 8

Common Denominators

• Common denominator: when 2 or more fractions have the same denominator

• We need common denominators (the same number of pieces) to be able to add or subtract fractions

• Easiest Common Denominator: multiply the denominators together to find a common multiple. This will be the common denominator.

• Then, multiply each fraction by the others' denominator to find equivalent fractions.

Multiple Choice

Which of the following can be a common denominator for 4/5 and 3/4?

• 15

• 20

• 4

• 2

Multiple Choice

Multiply each fraction by the others' denominator to find equivalent fractions for

 $\frac{3}{6}\ and\ \frac{2}{3}$  What are the equivalent fractions?

•  $\frac{3}{18\ }\ and\ \frac{2}{18}$  

•  $\frac{9}{18}\ and\ \frac{12}{18}$