Multiply Whole Numbers
Solve:
832 x 5 =
4,160
Draw a bar model to match:
8 times as many as 4 is 32
What is this property:
7 x 3 = 3 x 7
Commutative Property
Jill says 800 x 5 is 400. Why is she wrong?
The correct answer is 4,000.
8 x 5 is 40. But there are two zeros in 800. Jill only carried over one of the zeros.
Solve with distributive property:
6 x 8
Work may vary. Answer is 48
36,984
Rewrite two ways: 8 x 7 = 56
_____ is _____ times as many as _____.
_____ is _____ times as many as _____.
56 is 7 times as many as 8.
56 is 8 times as many as 7.
Use the Associative Property to solve:
7 x 3 x 4
4 x 3 x 7
12 x 7
84
Darien had 6 cookies. Her brother had 4 times as many as Darien. Darien says her brother has 10 cookies. Why is Darien inncorrect?
Darien is incorrect because she used addition instead of multiplication.
True or False:
68 x 13 = (60 + 10) x 78 x 3
False
Solve: 67 x 82
5,494
Allie has 36 apples and Peyton has 6 apples. How many times as many apples does Allie have as Peyton has? Write and solve an equation to find the answer?
6 x ___ = 36
Peyton has 6 apples.
Use the distributive Property to solve:
15 x 7
Work may vary
Answer: 105
Alice multiplies 7,903 by 3 and gets the incorrect product of 23,712. Find the correct product and explain what Alice does wrong.
Alice's work:
(7,000 x 3) + (900 x 3) + (0 x 3) + (3 x 3)
21,000 + 2700 + 3 + 9 = 23,712
Alice multiplies 0 and 3 and gets the answer 3.
0 x 3 is 0.
The correct answer is 23,709
Write a word problem to match: 3 x 7 = 21
Answers may vary
Solve: 783 x 12
9,396
A number is 8 times as much as 4. Which equation represents the comparison?
8 x 4 = 32
At a birthday party, some tables hold plates of cupcakes.
There are 2 tables.
Each table has 3 plates.
Each plate holds 9 cupcakes.
How many cupcakes are at the birthday party?
54 cupcakes
Fred multiplies 73 by 13 and gets the incorrect product of 219. Find the correct product and explain what Fred does wrong.
Fred's work:
73 x 13 = (70 x 3) + (3 x 3) = 210 + 9 = 219
Fred forgot to multiply the tens digit in the second factor.
Answer: 949
Tell whether the expression could be used to find 6 × 9.
Choose Yes or No.
a. 9(7 ‒ 1) □ Yes □ No
b. 6(10 ‒ 1) □ Yes □ No
c. (9 × 8) ‒ (9 × 1) □ Yes □ No
d. (6 × 5) + (6 × 4) □ Yes □ No
a. yes
b. yes
c. no
d. yes
Solve: 3,078 x 63
193,914
Create a bar model to represent 5 x 9.
Write a word problem to match.
Answers may vary.
Alberto walks 3 miles for each hour for 2 hours a day. How many miles does Alberto walk in 5 days?
30 miles
Amanda multiplies 156 by 8 and gets the incorrect product of 1,240. Find the correct product and explain what Amanda does wrong.
Answer: 1,248
At the music store, the shelves hold bins of hand bells.
- There are 2 shelves.
- Each shelf holds 9 bins.
- Each bin holds 4 hand bells.
How many hand bells are at the music store?
72 hand bells