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5th Grade Module 2 – Lesson 29
Lesson 29: I can solve division word problems involving multi-digit division with group size unknown and the number of
groups unknown.
5th Grade Module 2 – Lesson 29
Unit Conversions
1 liter = ___ mL1 foot = ___ inches1 kg = ___ g1 lb = ___ oz0.413 liters = ____ mL0.052 liters = ____ mL.397 kg = ____ g.013 kg = ____ g
5th Grade Module 2 – Lesson 29
Divide Decimals by Two-Digit Numbers
8.61 ÷ 21 = ____4.9 ÷ 14 = ____24 ÷ 16 = ____.32 ÷ 40 = ____8.4 ÷ 40 = ____
5th Grade Module 2 – Lesson 29
Application ProblemA one-year (52 week) subscription to a weekly
magazine is $39.95. Greg calculates that he would save $219.53 if he subscribed to the magazine instead of purchasing it each week at the store.
What is the price of the individual magazine at the store?
5th Grade Module 2 – Lesson 29
Application ProblemA one-year (52 week) subscription to a weekly
magazine is $39.95. Greg calculates that he would save $219.53 if he subscribed to the magazine instead of purchasing it each week at the store.
What is the price of the individual magazine at the store?
219.53 + 39.95 = 259.48
259.48 ÷ 52 = 4.99
5th Grade Module 2 – Lesson 29
Concept DevelopmentLamar has 1354.5 kilograms of potatoes to deliver in equal amounts to 18 stores. 12 of the stores are in the Bronx. How many kilograms of potatoes will
he deliver to stores in the Bronx?
Will the amount delivered to the Bronx be more or less than half of the
total amount? How do you know?
5th Grade Module 2 – Lesson 29
1354.5
12 stores in Bronx 1354.5 ÷ 18 = 75.25 75.25 x 12 = 903 kg
The stores in the Bronx receive 903 kg of potatoes.
5th Grade Module 2 – Lesson 29
Concept DevelopmentValerie uses 12 oz of detergent each week for her
laundry. If there are 75 oz of detergent in the bottle, in how many weeks will she need to buy a new
bottle of detergent?
Solution on next slide…
5th Grade Module 2 – Lesson 29
75 oz
How many 12’s would fit in 75?
Valerie will have to buy detergent after 6 weeks because she won’t have enough for a 7th week.
12 12 ?
5th Grade Module 2 – Lesson 29
Concept DevelopmentJim Nasium is building a tree house for his two
daughters. He cuts 12 pieces of wood from a board that is 128 inches long. He cuts 5 pieces that
measure 15.75 inches each, and 7 pieces evenly cut from what is left. Jim calculates that due to the
width of his cutting blade, he will lose a total of 2 inches of wood after making all the cuts. What is
the length of each of the seven pieces?
Solution on next slide…
5th Grade Module 2 – Lesson 29
128 inches
7 pieces from what’s left
Each of the 7 pieces is 6.75 inches long.
15.75 15.75 15.75 15.75 15.75 2
5th Grade Module 2 – Lesson 29
Concept DevelopmentThe area of a rectangle is 56.96 square meters. If
the length is 16 m, what is its perimeter?
Solution on next slide…
5th Grade Module 2 – Lesson 29
Area = 56.96
16
16
? ?
16 x ? = 56.96
The perimeter is 39.12 meters.
5th Grade Module 2 – Lesson 29
Concept DevelopmentA city block is 3 times as long as it is wide. If the
total distance around the block is 0.48 kilometers, what is the area of the block in square meters?
Solution on next slide…
5th Grade Module 2 – Lesson 29
width
length
The area of the block is 10,800 square meters.
60 60 60
60
One side
One side
One side
One side
.48 km480 m
480 ÷ 8 = 60 m per unit.60 x 180 = 10,800.
5th Grade Module 2 – Lesson 29
Get Ready to Complete theProblem Set on Your Own!
Complete Pages 2.H.21 & 2.H.22You will have 15 minutes to work.
Try your Best!
5th Grade Module 2 – Lesson 29
LET’S DEBRIEF• What did the divisor represent in each
equation?
• What did the unknown represent for each?
• How did that change the model you drew?
• Which is easier to draw?
5th Grade Module 2 – Lesson 29
EXITTICKETPage 2.H.23
