Multiplication Facts
Error Analysis
Multiplication Problems
Division Problems
Understanding
100
7x80
560
100
Spot the Error
6x5 is 30 so we have to regroup the 3 over. 6 times 1 plus 3 is 9, not 8
100
249x7
1743
100
`810div9`
90
100
When we are dividing, we are looking at the size of each ______ or how many in each ______
Group
200
6x40
240
200
Spot the error and find the correct answer
7-3 is 4, not 5. This will also change our final answer to 95 R6
200
92x14
1288
200
`1435div5`
287
200
If we have the digit 7 in the hundred's place, what value does this represent?
700
300
12x8
96
300
Spot the error and find the correct answer
When multiplying the tens place, 7x3 is 21 and we carried over the 1 from 4x3, so 21+1 is 22, this mistake is that they put down a 3 instead of a 2. The correct answer is 13,090
300
88x11
968
300
`495div7`
70R5
300
True or False: You can check your answer to a division problem by using multiplication
True
Example
`150 div 3=50
50x3=150`
400
9x7
63
400
Spot the errors and find the correct answer
They said that 20 goes into 143 8 times and tried to do 143-160 which is not possible. It should be
20 goes into 143 7 times
143-140=3
Bring down the 1
20 goes into 31 once
Final Answer: 71 R11
400
1234x2
2468
400
`6576div20`
328R16
400
What does this acronym mean?
D
M
S
C
B
Does-Divide
McDonalds-Multiply
Sell-Subtract
Cheese-Check
Burgers-Bring Down
500
7x7
49
500
Spot the error and find the correct answer
They forgot to bring down the 4.
Correct answer 43 R4
500
612x36
22,032
500
`789div14`
56R5
500
When I am reading a word problem, how can I determine whether or not I need to use multiplication or division?
Answers will vary***
Key words: Group size, number of groups, total amount