Fill in the blank
4 2 8
x 3
-----------
? , ? 8 4
1, 2 8 4
Fill in the blank
4 4
x 3 1
_______
? ?
+ 1 3 2
------------
1 7 6
44
Fill In The Blank
3 2 8
x 9 1
----------
3 2 8
+ 2 9 5 2
_____________
3, 2 ? ?
8 & 0
What is the name of the answer to a multiplication problem.
Product
Explain why 100 x 2000 is either a good or bad estimate for 12 x 180?
No, the estimate would be far too large.
Is the following equation true or false?
7 0 3 x 6 = 4,218
True!
Is the following equation true or false? Explain your reasoning.
20 x 20 = 40
False, 400
Is the following equation true or false?
8 6 3
x 1 3
----------
2, 5 8 9
+ 8 6 3
__________
3, 4 5 2
False, It should have been 2,589 + 8,630 = 11,219 there was not a zero in the second number on the bottom.
There are four seasons in one year, how many seasons are in 110 years?
440 seasons
What is a good estimate for 497 x 6?
500 x 6 b/c single digit stays the same and round to nearest hundred.
Find the error
4 5 8
x 4
--------
1,632
They didn't carry the thirty into the the 50 x 4
Should have been 32 + 200 + 1,600 = 1,832
Find the error
1 7
x 7 1
-------
1 7
+ 4 9 0
__________
5 0 7
70 x 17 is 1,190
not 490
Find The Error
2 4 0
x 5 5
_________
1 2 0
+ 1 2 0 0 0
There is a missing zero in the first product.
134 cars went around the roller coaster track and each car on the roller coaster held 4 people. What is the number of people that went on the ride?
536 people
Describe the difference between an overestimate and underestimate.
Overestimate has an answer larger than the product while underestimate has a smaller answer than the actual product.
Which of the following answers is correct for
2 5 1 x 3 =
a) 2 3 5
b) 6 0 3
c) 7 5 3
d) 7 7 7
C
Which of the following answers is correct for
49 x 17 =
a) 6 8
b) 4 9 0
c) 8 1 1
d) 8 3 3
D
Which of the following answers is correct for
6 5 0 x 3 3 =
a) 20, 040
b) 21, 450
c) 2,045
d) 2,150
B
Mrs. Willis is planning a field trip and will need 13 vans for the fifth graders. Each van can hold 12 people. How many students does she intend to bring?
156 people
Rounding to the nearest hundred, what is the best estimation for this equation?
1 0 5 x 2 9 5
100 & 300
Estimate is 30,000
Solve the following
4 5 4 x 4 =
1 , 8 1 6
Solve the following
5 3 x 4 2 =
2,226
Solve the following
4 5 4 x 4 0 =
18 , 160
Mr. Craine has fifty bags of golf balls that each have a dozen in them. How many total golf balls does he have?
600
Explain Why Estimating Is Important For Multiplying Numbers.
Helps us learners quickly find what our answer should be around.