Help Please:o)

[Guest]

Can anyone please tell me how to write 8x5=40 six ways??

I've come up with four:

8x5=40 5x8=40 40 divided by 5 equals 8 and 40 divided by 8 equals 5

THanks in advance :?

 

[stapel]

"Fact families" usually come in the set of four that you've already listed. What does your book/class give as the other two ways? (Providing an example from your text would be very helpful.)

Thank you.

Eliz.

. . . . .Math Cats: activities with fact families

. . . . .Houghton-Mifflin: Teaching Models

 

[Gene]

How about 8+8+8+8+8
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Gene

 

[Unco]

For symmetry: 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 = 40

 

[Gene]

Gee, how'd I miss that? :evil:
---------------
Gene

 

[Mrspi]

How about these?

2*(4*5)

4*(2*5)

5*(4*2)

10*4

1*40

Perhaps I'm oversimplifying this....

 

[soroban]

Hello, braxmade!

Can anyone please tell me how to write $\displaystyle 8\,\times\,5\:=\:40$ six ways??

I've come up with four:

$\displaystyle 8\,\times\,5\:=\:40,\;5\,\times\,8\:=\:40,\;40\,\div\,5\:=\:8,\;40\,\div\,8\:=\:5$

Since $\displaystyle \,8\,\times\,5\;=\;40\,$ means "eight 5's are 40",
$\displaystyle \;\;$How about: $\displaystyle 5\,+\,5\,+\,5\,+\,5\,+\,5\,+\,5\,+\,5\,+\,5\;=\;40$

Since $\displaystyle \,8\,\times\,5\:=\:5\,\times\,8$, we have "five 8's are 40",
$\displaystyle \;\;$Hence: $\displaystyle \,8\,+\,8\,+\,8\,+\,8\,+\,8\:=\:40$