Easiest Common Denominator

What are the steps for subtracting fractions with a common denominator?

• Find a common numerator, subtract the denominators, simplify if necessary

• Find a common numerator, add the denominators, simplify if necessary

• Find a common denominator, subtract the numerators, simplify if necessary

• Find a common denominator, add the numerators, simplify if necessary

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

What should be done after finding a common denominator?

• Multiply the denominators

• Add or subtract the numerators

• Multiply the numerators

• Divide the denominators

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What are the steps for adding fractions with a common denominator?

• Find a common numerator, subtract the denominators, simplify if necessary

• Find a common denominator, subtract the numerators, simplify if necessary

• Find a common numerator, add the denominators, simplify if necessary

• Find a common denominator, add the numerators, simplify if necessary

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

What is the first step to add or subtract fractions with different denominators?

• Multiply the numerators

• Find a common denominator

• Convert the fractions to have the same numerator

• Add or subtract the denominators

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is the concept of a common denominator?

• denominator that is uncommon to all fractions

• denominator that is common to all fractions

• denominator that is equal to the difference of the numerators

• denominator that is equal to the sum of the numerators

A common multiple of two or more denominators

• common denominator

• common multiple

• equivalent fraction

• simplest form

How do you add and subtract unlike fractions?

• You add the numerator and denominator together just like you would in like fractions

• You either find the Easiest Common Denominator or the LCD and then add the like fractions together

• What are unlike fractions?

• Multiply numerator and denominator then simplify

Tags

CCSS.7.NS.A.1C

How do you simplify a fraction?

• You guess

• Find LCD and divide the numerator and denominator

• You multiply them then subtract them by 2

Which of these numbers could NOT be a common denominator for these two fractions?
2/4   and   3/8

• 32

• 12

• 8

• 24

Which of these numbers could NOT be a common denominator for these three fractions?
1/3   and 2/5   and   3/10

• 15

• 30

• 60

• 90