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Multiplication and Division

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by

Nathan Hansen

on 16 December 2014

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Transcript of Multiplication and Division

Multiplication is repeated addition. For example... 4x6 is just like 6+6+6+6. Another example... is 7x2 is just like 2+2+2+2+2+2+2 or 2x7 is 7+7.
Multiplication
This is a way you would use for higher numbers.
The Box
This way is easy but not as fast.
Break Apart
5's and 10's are really easy numbers to multiply with
For 9's, just times the number by 10 and subtract the number that you multiplied with, like if the question 5x9 you would figure it out by 5x10=50 and 50-5=45 so 5x9=45
And you can multiply in groups like 5x9 is 5, 10, 15,20, 25, 30, 30, 35, 40, 45
Easy ways to Multiply
Division is repeated subtraction. For example... 15-5 is like 15-5-5-5. Another example is 56-7 is just like 56-7-7-7-7-7-7-7-7.
Division
This strategy is good for a lot of different types of division.
Hang Man
This way is really easy for small numbers.
Multiplication
Easy Ways to Divide
By: Ben & Nathan
371x629=______
300 70 1
600

20

9
3x6=18
18 add 4 0's
=222,600

=7,420

=3,339
180000
42000
600
6000
1400
20
9
2700
630
222,600
7,420
3,339
233,359
233,359
349x724=______
300x700=210000
300x20=6000
300x4=1200
40x700=28000
40x20=800
40x4=160
9x700=6300
9x20=180
9x4=36
210000
6000
1200
28000
800
160
6300
180
36
252,676
252,676
3x7=21
2 add 2 0's
Conclusion
We hope we have taught you something that will work and help you be more accurate and efficient.
Thank
You!
518-39=___
:
39
518

39x10=390
10
-390
128
39x3=117
-117
11
3
10+3=13
so the answer is 13
with a remainder
of 11.

13
R11
13
R11
:
:
72-18=_
:
18x_=72
18, 36, 54,72
1 2 3 4
4
4
You can also divide in groups just like multiplication if the question is 9-3 it would be 9-3-3-3
Multiples 2 and 5 are really easy numbers to divide like 12-2=6
Dividing by tens is as easy as moving the decimal point left we know it seems like 100 does not have a decimal point but it does (100.0) so 100.0-10=10.00
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Multiplication and Division
Full transcript