Multiplication Comparisons
15 is 3 times as many as 5.
Draw a model
(3 squares with a 5 inside)
8 x 90=?
720
Estimate the product by rounding:
4 x 472
2,000
the distributive property:
6 x 13 =?
Answers will vary:
6 x (5 x 8)
6 x (10 x 3)
6 x (9 x 4)
Use mental math to solve:
4 x 7 x 25
700
Write a comparison sentence:
6 x 3 = 18
6 times as many as 3 is 18
3 x 40 = ?
120
Estimate the product by rounding:
9 x 54 =?
450
distributive property:
6 x 16 =?
6 (10 x 6)= 96
6 (12 x 4)
6 (9 x 7)
What is a factor?
two or more numbers multiplied together to get another number
write the eqation that represents this sentence:
24 is 4 times as many as 6
24=4 x 6
7 x 800 = ?
5,600
3 x 832 =?
2,400
Expanded form:
3 x 1250 =
3 x (1,000 + 200+50) =3750
What is the Distributive Property
I can break apart one of the factors in a multiplication problem to make them friendlier (easier) to multiply.
Draw a model and write the equation:
6 times as many as 2 is 12
6 x 2 =12
8 x 200 = ?
1600
Find two numbers the exact number is between:
8 x 684
4,800 and 5,600
expanded form:
5 x 143 =
5 x (100 + 40 +3 )
Estimate then solve:
42 x 4
estimate:160
exact answer;168
write a comparison sentence about pet food that can be represented using the equation
12 = 4x 3
Possible answer:
Ms. Priester bought 12 bags of dog food, which is 4 times the number of bags she already has.
4 x 5,000 = ?
20,000
Find the possible unknown factor of the estimated product:
32,000 = 6 x ?
any number that falls between 250 to 300
expanded form:
4 x 5689 =?
4 (5000 + 600 + 80 + 9)
Estimate then solve:
2 x 699
estimate: 1400
exact answer:1398