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# diag_exam - Comments on Diagnostic Exam and Reference...

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Comments on Diagnostic Exam and Reference Tables Here, I’m talking about questions on the diagnostic exam that a good number of people missed. Statistics are based on the 6th period class. (I never got them for the 7th period class.) I am assuming you have the exam and the answer key to the exam. I distributed these and checked multiple times to be sure people had them. When you see something like: Q1 (16): It means question 1, and that 16 out of 34 people got it wrong. Q1(16): Counting sig digits. Q2(14): Adding numbers and maintaining sig digits. Q3(7): Multiplying numbers and maintaining sig digits. 1. If a number has a decimal point, scan the number from the left until the first nonzero digit is encountered. Then count this and all succeeding digits as significant. 2. If a number has no decimal point, scan the number from the right until the first nonzero digit is encountered. Then count this and all succeeding digits as significant. 3. When multiplying two numbers, the product has the same number of sig digits as the factor with the least number of sig digits. 4. When adding or subtracting two numbers, the answer has sig dig- its such that it goes out to the same precision (i.e. decimal place) as the addend with the least precision. ex: 2 . 33 - 2 . 022 = . 31. Notice that something with 3 sig digits minus something with 4 sig digits, in this case, resulted in something with 2 sig digits. The determining issue here is that we can only go to the hundredths place. Another example: 7 . 23 + 93 . 2 = 100 . 4. Here, we can only go to the tenths place. One more, 1300+265 = 1600; here we can only go to the hundreds place.

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