Vocab and Properties
3490 - 1782 = m
The letter m is called a _____________.
variable
What are all of the partial products for 27 x 5?
A. 35, 10
B. 12, 7
C. 35, 100
C. 35, 100
The product of 2 factors is 2800. One of the factors is 40. What is the other factor?
70
Estimate by rounding.
88 x 51
90 x 50 = 4,500
A box of crayons has 64 crayons in it. Every student in the grade has one. box. There are 44 people in the grade. About how many crayons is that total? (Estimate)
60 x 40 = 2,400 crayons
Name the property.
3 x 25 = 25 x 3
Commutative Property of Multiplication
What is the missing partial product for 13 x 23.
9, _____, 60, 200
30
415 x 3 =
1,245
Use rounding to estimate:
48 x 17
50 x 20 = 1,000
A restaurant sells an average of 9 hamburgers a day. How many would this mean they sell in a year? (Assume a year is 365 days.)
365 x 9 = 3,285 hamburgers
Is the partial products strategy a property of multiplication?
No, it is a strategy for solving a multiplication problem.
Which expression can be used to find 8 x 45?
A. (8 + 40 + 5)
B. (8 x 40) + (8 x 5)
C. (8 x 40) x (8 x 5)
D. (8 + 40) + (8+ 5)
B. (8 x 40) + (8 x 5)
46 x 26 =
1,196
Estimate using compatible numbers:
24 x 12 =
25 x 10 = 250
A ticket to an Orioles game cost $49. How much would it be to buy a ticket to 18 games?
$49 x 18 = $882
The number 12 in this equation is called the _______.
6 x 2 = 12
Product
Name the partial products for 83 x 74.
12 320 210 5,600
A store has 10 boxes each filled with 88 plates. How many plates are in all ten boxes?
880 plates
Select all of the expressions that could be used to estimate 32 x 14.
A. 30 x 20
B. 30 x 10
C. 14 x 32
D. 32 x 10
B and D
Mia has a collection of 97 stickers. A toy store has 25 times as many stickers. How many stickers does the store have?
97 x 25 =2,425 stickers
Using the distributive property, show how you would multiply 13 x 55.
(10 + 3) x (50 +5)
(10+3) x 50 + (10 +3) x5
(10 x 50)+(3 x 50) +( 10x5) + (3x5)
= 500 + 150 + 50 + 15
=715
Use partial products to solve 3,499 x 8.
3,499 x 8 = 27,992
8x9 = 72
8x90 = 720
8x400 = 3,200
8x3,000 = 24,000
Emma's Flower shop charges $35 for a small bouquet of flowers. If Emma sells 15 small bouquets on Monday and 39 small bouquets on Saturday, how much money did she earn?
$1,890
Use estimation to see if this answer is reasonable:
34 x 52 = 2,288
Rounds to ________ x ________ = _________
Reasonable OR Not reasonable
30 x 50 = 1,500
2,288 is not a reasonable answer
The Jessup Family pays $75 a month for a gym membership. Mr. Jessup estimates that the family spends about $750 per year on their membership. Is his estimate reasonable?
Yes, because 12 is close to 10 and
$75 x 10 = $750