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Unformatted text preview: Math 130
Test 1
Fall 2007
Matt Davis Question Points You have 50 minutes for the exam. Calculators, notes or other aids are not
allowed. (The use of your brain is encouraged.) If a question is unclear to
you, please ask about it. Be sure to show all your work. (I mean itll) Name 1. (20 points) Compute 552 + 24, using the algorithm of your choice. Then, write out the same compu—
tation in detail (using expanded form, etc.) and explain how the computations relate to each other. Why
does division involve so much subtraction? 2. (5 points) Simplify 27 » 59. Justify your steps! 3. (5 points) Compute 136 X 17 using either the standard algorithm or the lattice method. 4. (10 points) Simplify the expression ((6 x (4 + 523)) + 2) + 2. Justify each step of the simpliﬁcation. 5. (10 points) Compute the following using mental math techniques, showing your thinking along the
way. a. 9 x 45 b. 960 + 30 c. 28 X 25 d. 62 — 17 e. 48 X 5 6. (15 points) Write up two solutions to the following problem, one using a bar diagram (no algebra), and one using algebra.
Michael, Jim, and Connie are picking apples. Connie and Jim pick the same amount, which is 14 more
than Michael does. If they picked 100 apples total, how many did Michael pick? r z. (10 points) A video store charges $10 a. month for a membership, but videos only cost $2ito rent.
Write an equation relating the amount you spend at the store in a month to the number of movies you rent,
and sketch a graph that conveys this information. Make sure you explain the meaning of any variables you
use. 8. (10 points) Name the three interpretations for subtraction and give an example of each. ...
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 Spring '07
 TERWILLIGER
 Computer Science, Mental Math techniques

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