
Calculate
mentally the
highest
common factor of these two numbers, type it in the control box below and hit
Enter.
 If
you need a hint, click on the up and down triangles above and you
will see the prime factor decomposition of each number, but in that case the
message CONGRATULATIONS will have another colour.
 Every
time you click on Init, two other random numbers will appear. Write
down the accuracy and error rate in 20 of these exercises.

