Estimating Products
Estimate the product: 12 x 11
10 x 10 = 100
Find the product of 20 x 20
400
The product of two factors is 1,800. One of the factors is 30. What is the other factor?
60
Use an area model to find 17 x 14
10 x 10 = 100
10 x 4 = 40
7 x 10 = 70
7 x 4 = 28
17 x 14 = 238
Estimate the product: 28 x 54
30 x 50 = 1,500
Find the product of 43 x 60
2,580
The product of two factors is 4,000. One of the factors is 80. What is the other factor?
50
The lawn service charges $65 to mow, weed, and fertilize a lawn. How much did the lawn service earn if 11 lawns were tended in June and 22 lawns were tended in July?
(22 + 11) x 65
33 x 65 = $2,145
Estimate the product: 68 x 32
70 x 30 = 2,100
Which of the following uses properties of operations to help find 79 x 31
a) 7 x 9 x 3 x 1
b) (70 + 9) x (30 + 1)
c) 79 + 31
d) 70 x 9 x 30 x 1
b) (70 + 9) + (30 + 1)
The product of two factors is 2,100. One of the factors is 70. What is the other factor?
30
A bakery has 13 bins of bagels. Each bin is filled with 38 bagels. Find the total number of bagels.
494 bagels
Ms. DiCalogero bought 48 notebooks. Each notebook has 64 pages. What is a good way to estimate the total number of pages Ms. DiCalogero bought?
a) 40 x 70
b) 50 x 60
c) 48 x 64
b) 50 x 60
Which two expressions are equal to 520?
a) 52 x 10
b) (50 x 10) + 2
c) (50 x 10) + (20 x 10)
d) (50 x 10) + (2 x 10)
e) 20 x 10 + 5 x 10
a) 52 x 10
d) (50 x 10) + (2 x 10)
The product of two factors is 1,400. One of the factors is 20. What is the other factor?
70
Ms. DiCalogero swam 15 laps 13 times in May. She swam 16 laps 17 times in June.
Find the total number of laps Ms. DiCalogero swam during the two months.
467 laps
Ellie has a contract and needs to make 27 beaded necklaces. She puts 32 beads in each necklace. Which is the best way to use rounding to estimate the number of beads Ellie needs? What is the exact number of beads?
(Hint: Estimate first and then solve the actual problem)
30 x 30 ; 864
What is 45 x 62 written in distributive property. Please also find the the product.
(40 + 5) x (60 + 2) = 2,790
The product of two factors is 20,000. One of the factors is 50. What is the other factor?
400
One painting is 28 feet long and 13 feet wide. Another painting is 19 feet long and 11 feet wide. What is the difference between the areas of the two paintings?
(Hint: Area = Length x Width)
155 square feet