Adding and Subtracting Mixed Numbers Using Models

What number is shown in this model?

• 3 2/3

• 11/12

• 4 2/3

Jarrod is adding the mixed numbers: 3 2/6 and 7 5/6 He uses these steps to find the sum. Step 1: 3 + 7 = 10 Step 2: 2/6+5/6=7/12 Step 3: Answer is 10 7/12 What mistake did Jarrod make?

• In Step 1, he should have multiplied 3 and 7 by 6 before adding.

• In Step 2, he should not have added the denominators.

• In Step 2, he should have multiplied 2 and 5 instead of adding them.

• In Step 3, he should not have added the whole number and fraction.

Indianapolis had 1 1/10 inches of snow in November. In December, they had 5 2/10 inches of snow. In January, they had 6 inches of snow. What is the total number of inches of snow?

Indianapolis had 1 1/10 inches of snow in November. In December, they had 5 2/10 inches of snow. In January, they had 6 inches.

How much more snow did Indianapolis have in January than November?

8  2/4 - 3  1/3=
Reduce if needed.

• 5  2/12

• 5  1/6

• 11  1/6

• 8  2/3

6½ - 2⅔

• 4  1/6

• 3  5/6

• 4  1/2

• 3  1/2

Addition:
Find Lowest Common Denominator & solve
1    1/3   +    4    1/4 =

• 5    7/12

• 5    2/24

• 5    2/12

• 5    7/24

Find Lowest Common Denominator & solve
8     4/5    +    9    1/10  =

• 18   5/15

• 17   5/10

• 17   9/20

• 17   9/10

Marie needs 2 ¹/₄ yards of fabric/ She already has 1 ³/₈ yards. How many more yards of fabric does she need?

• ¹/₈ yard

• ³/₄ yard

• ⁷/₈ yard

• 1 ⁷/₈ yards

When the denominators are not the same, I must find a...

• common numerator

• common denominator

• equivalent fraction

• mixed number