Posted by **Gabby ( 5 grade)** on Monday, January 30, 2012 at 4:10pm.

how would you test to see whether 7 is a factor of 291?

- math -
**Reiny**, Monday, January 30, 2012 at 4:14pm
I would divide it out and see.

or

write down the number without the last digit

29

subtract twice the digit you skipped

29

-2

----

27

is 27 divisilbe by 7 ?

no ? , then neither was 291

for large numbers checking for divisibility by 7,

repeat the above process until you can tell.

Not very practical, but it works !!!

- math -
**Gabby ( 5 grade)**, Monday, January 30, 2012 at 4:18pm
why 2 if the end digit is 1?

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**Reiny**, Monday, January 30, 2012 at 4:21pm
notice I said, "twice" the number skipped.

2x1 = 2

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**Gabby ( 5 grade)**, Monday, January 30, 2012 at 4:24pm
i don't get it i want ms sue to help me!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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**Ms. Sue**, Monday, January 30, 2012 at 4:27pm
<g>

Reiny is a REAL math teacher; I'm not.

I'd just divide 291 by 7.

- math -
**Gabby ( 5 grade)**, Tuesday, January 31, 2012 at 3:55pm
WOW I BELIEVED IN YOU:P

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