Archive

Archive for July, 2009

Sample Exam 1 #32 error

July 31st, 2009

There was an error in #32. The file has been fixed.

Sample Exam #2 Updated

July 30th, 2009

Sample Exam #2 has been converted to 35 problems.

Updated Sample Exam #1

July 29th, 2009

Sample Exam #1 has been updated to make it 35 problems. I will update Sample Exam #2 by tomorrow.

mp3 files

July 26th, 2009

I’ve added mp3 recordings of the lessons. You can download these files and listen to them on your favorite mp3 player or burn them to a CD.

More problems to work …

July 13th, 2009

You can download all the published exams since 2000 here. I’ve removed the problems that are no longer on the syllabus. Please remember that none of these exams contain DM problems.

You can download a breakdown of the problems by topic here. Again none of these exams contained DM problems which make up about 20-25% of the exam now.

counting the number of payments

July 10th, 2009

Lots of students have trouble counting the number of payments. I recently answered this question for a student. Here is what I wrote:

What if I told you there was a payment at times 1, 2 and 3. How many payments is that? 3 of course, but what we really did (3-0)/1 = 3. So if there are payments at times 3, 6, 9, and 12 then we have (12 – 0) / 3 = 4 payments. If we have payments at times 20, 25, 30, 35, and 40 then we have (40 – 15) / 5 = 5 payments. If we have payments at times 22, 28, 34, …, 112 then we have (112 – 16) / 6 = 16 payments.