2007 AMC 8 Problems/Problem 18
Problem
The product of the two -digit numbers
and
has thousands digit and units digit
. What is the sum of
and
?
Video Solution
https://youtu.be/7an5wU9Q5hk?t=2085
Solution
We can first make a small example to find out and
. So,
The ones digit plus thousands digit is .
Note that the ones and thousands digits are, added together, . (and so on...) So the answer is
This is a direct multiplication way.
Video Solution by WhyMath
~savannahsolver
See Also
2007 AMC 8 (Problems • Answer Key • Resources) | ||
Preceded by Problem 17 |
Followed by Problem 19 | |
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | ||
All AJHSME/AMC 8 Problems and Solutions |
The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions.