LCM and Adding & Subtracting Fractions with Unlike Denominators

Front

What is the least common multiple (LCM)?

Back

The least common multiple (LCM) of two or more numbers is the smallest multiple that is exactly divisible by each of the numbers.

Front

How do you find the LCM of two numbers?

Back

To find the LCM, list the multiples of each number and find the smallest multiple that appears in both lists.

Front

What is the LCM of 15 and 2?

Back

30

Front

What is the LCM of 5 and 20?

Back

20

Front

What is the LCM of 6 and 8?

Back

24

Front

What is a fraction?

Back

A fraction represents a part of a whole and consists of a numerator (top number) and a denominator (bottom number).

Tags

CCSS.3.NF.A.1

CCSS.3.NF.A.2B

Front

What does it mean to add fractions with unlike denominators?

Back

Adding fractions with unlike denominators means you must first find a common denominator before you can combine the fractions.

Tags

CCSS.7.NS.A.1C

Front

How do you subtract fractions with unlike denominators?

Back

To subtract fractions with unlike denominators, find a common denominator, convert the fractions, and then subtract the numerators.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Front

What is the common denominator of 1/3 and 8/9?

Back

The common denominator is 9.

Front

What is 8/9 - 1/3?

Back

5/9

Tags

CCSS.7.NS.A.1C