Find the Unknown Number.
m = 9 x 2
m = 18
Select the equation that shows the identity property.
A. 50 x 7 = 7 x 50
B. 7 x 1 = 7
C. 8 x (10 + 30) = 8 x 40
D. 5 x 20 = (5 x 2) x (5 x 10)
B. 7 x 1 = 7
The answer in a multiplication problem.
Product
Study Hall has 63 desks. There are 9 desks in each row. How many rows of desks are there?
9 x n = 63
Snow White baked 5 batches of cupcakes. There were 20 cupcakes in each batch. How many cupcakes did she bake in all?
5 x 20 = 100 cupcakes
7 x n = 49
n x 5 = 0
n = 0
Zero Property of Multiplication
A number is multiplied by another number to find the product.
Factor
Cindy Lou Who spent $48 on 6 books. The cost of each book was the same. Which equation can be used to find the cost of one book?
6 x n = $48
30 x 7 =
210
w x 3 = 15
w = 5
Select the equation that shows the associative property.
A. 50 x 7 = 7 x 50
B. 3 x 60 = 3 x (20 x 20)
C. 8 x (10 + 30) = 8 x 40
D. (7 x 2) x 2 = 7 x (2 x 2)
D. (7 x 2) x 2 = 7 x (2 x 2)
The value of each digit in a number is based on the location of the digit.
Place Value
Buzz Lightyear must bring 27 tennis balls to tennis camp. Tennis balls come in cans of 3. How many cans does he need?
c = 9 cans
Max buys 5 boxes of envelopes. There are 70 envelopes in each box. How many envelopes does Max buy altogether?
5 x 70 = 350 envelopes
4 x y = 2 x 6
y = 3
Select the equation that shows the commutative property.
A. 50 x 7 = 7 x 50
B. 3 x 60 = 3 x (20 x 20)
C. 8 x (10 + 30) = 8 x 40
D. 5 x 20 = (5 x 2) x (5 x 10)
A. 50 x 7 = 7 x 50
A letter that represents an unknown number.
Variable
Invitations cost $3 for a pack of 8. Olaf gives the cashier $20 to buy invitations and gets $11 in change. How many packs of invitations does Olaf buy?
3 x y = 9
y = 3 packs of invitations
Tiana saves all her dimes. Today she is getting them out of her coin jar and wrapping them to take to the bank. She finds she has 300 dimes. It takes 50 dimes to fill each paper wrapper and make a roll. Write an equation using n for the unknown factor, then solve.
50 x n = 300
n = 6
5 x g = 36 - 6
g = 6
Select the equation that shows the distributive property.
A. 50 x 7 = 7 x 50
B. 3 x 60 = 3 x (20 x 20)
C. 8 x (10 + 30) = 8 x 40
D. 5 x 20 = (5 x 2) x (5 x 10)
C. 8 x (10 + 30) = 8 x 40
A number sentence that uses the equal sign to show that two amounts are equal.
Equation
The Grinch uses 4 red beads and 3 blue beads to make a belt. How many beads will the Grinch use to make 4 belts?
4 + 3 = 7
7 x 4 = 28 beads
Roz saves all her dimes. Today she is getting them out of her coin jar and wrapping them to take to the bank. She finds she has 250 dimes. It takes 50 dimes to fill each paper wrapper and make a roll. Write an equation using n for the unknown factor, then solve.
50 x n = 250
n = 5