Estimating & Rounding
Ian works 18 hours a week. Write and solve an equation estimating how many hours Ian will work in 52 weeks.
20 x 50 = 1,000
Karina is making 20 pine cone wreaths to sell at a fair. She needs 13 pine cones for each wreath. How many pine cones does Karina need in all?
260 pine cones
Tess has 15 pages in her coin collectors album. Each page holds 32 coins. Tess wants to find how many coins will fit in her entire album. Which partial product is missing from her work?
32
x15
10
?
20
+300
150
Hannah hiked 12 miles 13 times last month. She hiked 14 miles 12 times this month. How may miles did Hannah hike during the past 2 months?
324 miles
The numbers you multiply to get a product
Factors
A movie theater sells 50 tickets for each showing of a movie. The theater showed the movie 40 times. How many tickets did the theater sell?
2,000 tickets
When the Discount Tire Store sells a new tire, the profit is $15. Write an expression you would use to find the profit the store receives if they sell 60 new tired in one day.
60 x 15
Jonah bought 25 postcards that cost 17 cents each. He used partial products to find the total cost in cents. Which are NOT possible partial products for 25 x 17?
35 50 60 140 170
60 and 170
Jessa's plant shop has 12 shelves. Each shelf holds 18 plants. Find the number of plants the shelves can hold.
216 plants
You use this to check if your answer is reasonable
estimating
There are 21 rows of seats. Each row has 42 seats, Use rounding to estimate the total number of seats.
800 seats
The librarian ordered 29 sets of bookmarks. Each set contained 20 bookmarks. How many bookmarks did the librarian order?
580 bookmarks
Leo drew an area model to find 19 x 15. Write the equation and partial product for each rectangle Leo put in his area model.
10 x 10 = 100
10 x 5 = 50
9 x 10 = 90
9 x 5 = 45
Brandon gets paid $25 to mow the lawn. He plans on mowing the lawn 19 times before the end of summer. Write and solve an equation to find the amount of money Brandon will make.
$25 x 19 = $475
a letter or symbol that represents a number
variable
Quinn earns $11 an hour. She recorded the number of hours she worked over a 1 month period.
Week A: 15 hours worked
Week B: 24 hours worked
Week C: 22 hours worked
Week D: 18 hours worked
Estimate how much Phillip earned during the 1 month period.
$800
Benji's goal is to learn 15 new Spanish words each day. If Benji meets his goal, how many new Spanish words will he have learned after 40 days?
600 new words
LuAnn is practicing for her school's math Olympiad. Which expression shows one way LuAnn can use partial products to find 60 x 78?
A. (60 x 70) + (60 x 8)
B. (60 x 70) + (60 x 78)
C. (60 x 70) + (60 x 80)
D. (6 x 70) + (6 x 8)
A. (60 x 70) + (60 x 8)
Large tables in the library have 18 chairs and small tables have 12 chairs. How many chairs are at 15 large tables?
270 chairs
the answer to a multiplication problem
product
Ava earns $24 each time she helps her neighbor with household chores. Estimate how much money she will earn if she helps her neighbor 19 times. Use compatible numbers.
$500
Grant has 50 cases of pop. There are 40 cans in each case. How many cans of pop does he have?
2,000 cans of pop
A school bought 28 new microscopes. The price for each microscope was $87. Write the partial products and solve to find the cost for all the microscopes.
56 + 140 + 640 + 1,600 = 2,436
Jonah's landscape service charges $78 to plant a tree. What is the total cost to plant 18 trees on Tuesday and 23 trees on Wednesday?
$3,198
partial products