Question
how would you test to see whether 7 is a factor of 291?
Answers
Reiny
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 !!!
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 !!!
Gabby ( 5 grade)
why 2 if the end digit is 1?
Reiny
notice I said, "twice" the number skipped.
2x1 = 2
2x1 = 2
Gabby ( 5 grade)
i don't get it i want ms sue to help me!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Ms. Sue
<g>
Reiny is a REAL math teacher; I'm not.
I'd just divide 291 by 7.
Reiny is a REAL math teacher; I'm not.
I'd just divide 291 by 7.
Gabby ( 5 grade)
WOW I BELIEVED IN YOU:P