Adding and Subtracting Fractions with 10 and 100 as the Denominators

What is the first step in solving this problem? 
⅘ + ½ =

• Add the top parts of the fraction

• Rewrite the fractions in the simplest form. 

• Find a common denominator. 

• Make each fraction into an improper faction. 

Kathy painted \frac{1}{4} of a wall. Shelly painted \frac{2}{5} of the same. What part of the wall was still left unpainted?

How can you find a common denominator?

• Add the denominators together

• Pick your favorite number

• Find a common multiple for the two denominators

What is the first step in adding or subtracting fractions with unlike denominators?

• Write equivalent fractions

• Add the numerators

• List out the multiples to find a common denominator

• Simplify the answer

Add the Fractions!

• 27/100

• 37/10

• 37/100

• 27/10

Add the Fractions!

• 52/100

• 5/10

• 12/100

• 2/10

Add the Fractions!

• 75/10

• 75/100

• 65/100

• 60/100

Dean selects Teakwood stones and Buckskin stones to pave a path in front of his house. How many meters long will each set of one Teakwood stone and one Buckskin stone be?

• 71/100

• 33/100

• 33/10

• 66/10

What is denominator?

• Common fractions that you can judge other numbers against

• A whole number that is a common multiple of all the denominators of a set of fractions.

• the "bottom" number in a fraction that shows how many equal parts the item is divided into; the divisor of a fraction

• any part of a group, number or whole

What must you have to add and subtract fractions?

• Common numerators

• Different numerators

• Different denominators

• Common denominators