Estimate
How many zeros will be in the product of 4 × 500? Explain.
3 zeros
4x5 = 20 place 2 zeros = 2000
draw and area model for 365 x 3
1,095
456 x 8
3,648
The product of two factors is 2,000. One of the factors is 50. What is the other factor?
A) 20
B) 40
C) 200
D) 400
B) 40
make an area model
27 x 14
378
Lucas baked 18 dozen chocolate chip cookies and 15 dozen peanut butter cookies. About how many cookies did Lucas bake?
𝖠 400
𝖡 270
𝖢 150
𝖣 30
About 350 cookies
18 x 12
20 x 10 = 200
15x12=
15 x 10 = 150
200+150 = 350 cookies
find the [product of 1,874 and 3
5,622
126 x 3
Use the numbers below for the partial products and product
18. 30
60 180
600 300
378 387
product 378
partial products
300
60
18
Use an area model to find the product of 24 and 33.
792
make an area model
19 x 15
285
Don works 18 hours a week. Which expression shows a good way to use rounding to estimate how many hours Don will work in 52 weeks?
A) 10x50
B) 10x60
C) 20x50
D) 18x60
C) 20 x 50
select all the partial products
8 x 321
8 1,600
80 2,400
160
2,400
160
8
what is the product of 5 x 1,903
9,515
What is the product of 42 and 56?
Write and solve an equation to determine the product.
42 x 56 =
2,352
What is the product of 36 and 13?
468
The product of two numbers is 7,200.
800 x 9
90 x 80
Three friends want to take a bus trip to the Grand Canyon. The entire trip costs $1,025 per person,
plus $383 per person for the meal plan.
$4,224
What are the partial products when finding 1,874 x 3
5,400 2,000
3,000 210
2,400 12
3,000
2,400
210
12
Leah made 10 gift boxes of cookies for her friends. Each gift box holds 8 cookies. She had enough cookies to make 3 more full gift boxes. How many cookies did she make?
104 cookies
10 x 8 = 80
3 x 8 = 24
80 + 24 = 104 cookies
Margo hiked 12 miles 13 times last month. She hiked 14 miles 12 times this month. Use an area model to find the number of miles Margo hiked during the past 2 months.
Mr. Luca would like to purchase a digital keyboard for each of his 3 nieces and 1 nephew. The keyboard costs $105
Mr. Luca thinks the total cost should be about $200. Is this amount reasonable?
NO
105 x 4 =
100 x 4 = 400
not reasonable
Tickets for the resort cost $1,182 each for adults and $459 each for children. Find the cost for 3 adult tickets and 3 child tickets. Explain how you know your answer is reasonable.
$4,923
Bea's Bakery bakes 215 cookies and 45 muffins every hour. How many baked goods are baked in 4 hours?
1,040 goods
Grayson has 4 small photo albums and 6 large photo albums. Each small album can hold up to 112 photographs. Each large album can hold up to 184 photographs. How many photos can Grayson keep in the albums?
1,552 photos
Each year, Rochelle bakes pies to donate to a shelter. Throughout the year, she baked 22 pumpkin pies, 35 apple pies, and 17 blueberry pies. Each pie was cut into 10 equal slices. How many slices of pie did Rochelle donate to the shelter?
840 Slices