how would you test to see whether 7 is a factor of 291?
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 !!!
why 2 if the end digit is 1?
notice I said, "twice" the number skipped.
2x1 = 2
i don't get it i want ms sue to help me!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
<g>
Reiny is a REAL math teacher; I'm not.
I'd just divide 291 by 7.
WOW I BELIEVED IN YOU:P
To test whether 7 is a factor of 291, you can follow these steps:
1. Divide 291 by 7: Divide 291 by 7 to see if it evenly divides. The result is 41 remainder 4.
7
________
291 | 41
- 35
______
6
2. Check the remainder: If the remainder is 0, then 7 is a factor of 291. In this case, the remainder is 4.
Since the remainder is not zero, we can conclude that 7 is not a factor of 291.