2.3 Adding and Subtracting Fractions

How do I add/subtract fractions?

2.3 Adding and Subtracting Fractions How do I add/subtractThere are two ways fractions?

2.3 Adding and Subtracting Fractions How do I add/subtractThere are two ways fractions? Model

2.3 Adding and Subtracting Fractions How do I add/subtractThere are two ways fractions? Model Across 2/5 + 1/5 = ? Denominators the same, add across =)

2.3 Adding and Subtracting Fractions How do I add/subtractThere are two ways fractions? Model Across 2/5 + 1/5 = ? Denominators the same, add across =) =

2.3 Adding and Subtracting Fractions How do I add/subtractThere are two ways fractions? Model Across 2/5 + 1/5 = ? Denominators the same, add across =) = denominator stay the same

Evaluate (solve):

17/ /20 = ?

Evaluate (solve):17/ /20 = ? 17/ /20 denominators same, subtract across

Evaluate (solve):17/ /20 = ? 17/ /20 denominators same, subtract across =

Evaluate (solve):17/ /20 = ? 17/ /20 denominators same, subtract across = /20 simplify (pull out the copy cat)

Evaluate (solve):17/ /20 = ? 17/ /20 denominators same, subtract across = /20 simplify (pull out the copy cat) 4/20 ÷ 4/4 = 1/5

Evaluate (solve):17/ /20 = ? 17/ /20 denominators same, subtract across = /20 simplify (pull out the copy cat) 4/20 ÷ 4/4 = 1/5 5/18 + 7/18 = ?

Evaluate (solve):17/ /20 = ? 17/ /20 denominators same, subtract across = /20 simplify (pull out the copy cat) 4/20 ÷ 4/4 = 1/5 5/18 + 7/18 = ? 5/18 + 7/18 denominators same, add across

Evaluate (solve):17/ /20 = ? 17/ /20 denominators same, subtract across = /20 simplify (pull out the copy cat) 4/20 ÷ 4/4 = 1/5 5/18 + 7/18 = ? 5/18 + 7/18 denominators same, add across =

Evaluate (solve):17/ /20 = ? 17/ /20 denominators same, subtract across = /20 simplify (pull out the copy cat) 4/20 ÷ 4/4 = 1/5 5/18 + 7/18 = ? 5/18 + 7/18 denominators same, add across = /18 simplify (pull out the copy cat)

Evaluate (solve):17/ /20 = ? 17/ /20 denominators same, subtract across = /20 simplify (pull out the copy cat) 4/20 ÷ 4/4 = 1/5 5/18 + 7/18 = ? 5/18 + 7/18 denominators same, add across = /18 simplify (pull out the copy cat) 12/18 ÷ 2/2 = 6/9 simplify (pull out the copy cat)

Evaluate (solve):17/ /20 = ? 17/ /20 denominators same, subtract across = /20 simplify (pull out the copy cat) 4/20 ÷ 4/4 = 1/5 5/18 + 7/18 = ? 5/18 + 7/18 denominators same, add across = /18 simplify (pull out the copy cat) 12/18 ÷ 2/2 = 6/9 simplify (pull out the copy cat) 6/9 ÷ 3/3 = 2/3

-11/13 + 8/13 = ?

-11/13 + 8/13 denominators same, add across

-11/13 + 8/13 = ? -11/13 + 8/13 denominators same, add across Which number is bigger the 11 or 8? = - 3 Different signs take the Difference Take the sign in front of the bigger number

-11/13 + 8/13 = ? -11/13 + 8/13 denominators same, add across Which number is bigger the 11 or 8? = - 3 Different signs take the Difference Take the sign in front of the bigger number /13

-11/13 + 8/13 = ? -11/13 + 8/13 denominators same, add across Which number is bigger the 11 or 8? = - 3 Different signs take the Difference Take the sign in front of the bigger number /13 What if there is a whole number in front of the fraction?

-11/13 + 8/13 = ? -11/13 + 8/13 denominators same, add across Which number is bigger the 11 or 8? = - 3 Different signs take the Difference Take the sign in front of the bigger number /13 What if there is a whole number in front of the fraction? Add or subtract the whole number first then fraction

-11/13 + 8/13 = ? -11/13 + 8/13 denominators same, add across Which number is bigger the 11 or 8? = - 3 Different signs take the Difference Take the sign in front of the bigger number /13 What if there is a whole number in front of the fraction? Add or subtract the whole number first then fraction -5 6/ /7 = ?

-11/13 + 8/13 = ? -11/13 + 8/13 denominators same, add across Which number is bigger the 11 or 8? = - 3 Different signs take the Difference Take the sign in front of the bigger number /13 What if there is a whole number in front of the fraction? Add or subtract the whole number first then fraction -5 6/ /7 = ? Take the sign of the bigger-5 + 3= -2 Different signs take the Difference number

-11/13 + 8/13 = ? -11/13 + 8/13 denominators same, add across Which number is bigger the 11 or 8? = - 3 Different signs take the Difference Take the sign in front of the bigger number /13 What if there is a whole number in front of the fraction? Add or subtract the whole number first then fraction -5 6/ /7 = ? Take the sign of the bigger-5 + 3= -2 Different signs take the Difference number = - 4 Different signs take the Difference 7 7 7

-11/13 + 8/13 = ? -11/13 + 8/13 denominators same, add across Which number is bigger the 11 or 8? = - 3 Different signs take the Difference Take the sign in front of the bigger number /13 What if there is a whole number in front of the fraction? Add or subtract the whole number first then fraction -5 6/ /7 = ? Take the sign of the bigger-5 + 3= -2 Different signs take the Difference number = - 4 Different signs take the Difference /7