1 / 14

Testing Strategies

Testing Strategies. Mr. McKinney. Topics of Discussion. Reading Strategies Typing Correctly on the TI-84+ Your Calculator Can Do More than Just Calculate Why Calculate When You Can Just Estimate? There’s No Time Limit, So Work Backwards! No Numbers? That’s OK. Just Make Some Up.

trudyrichardson
Download Presentation

Testing Strategies

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Testing Strategies Mr. McKinney

  2. Topics of Discussion • Reading Strategies • Typing Correctly on the TI-84+ • Your Calculator Can Do More than Just Calculate • Why Calculate When You Can Just Estimate? • There’s No Time Limit, So Work Backwards! • No Numbers? That’s OK. Just Make Some Up

  3. Reading Strategies • On Monday, Dave drove exactly m miles. On Tuesday he drove 112 fewer miles than he drove on Monday. Which of the following expressions represents the total number of miles Dave drove on both days? • Read the question once through. • Reread the question, but this time underline the main question or the main purpose of the problem. • Double underline any words that are very important to remember. • Circle key data so you can easily find it. • Summarize the data. • Monday = m miles • Tuesday = m – 112 miles • Reread question and answer it. • Both days = m + m – 112 = 2m - 112

  4. Now You Try: Underline and Circle • A basketball player’s free throw percentage is m/a where m is the number of free throws made and a is the number attempted. If a player attempts 169 free throws and makes 130, what is his free throw percentage? • 0.808 • 1.300 • 0.692 • 0.769

  5. Typing Correctly on the TI-84 Plus • Your calculator doesn’t know what the problem is, just what you type in. So use parentheses often! • ALWAYS use parentheses when substituting a number into an equation. • Here are some questions to ask yourself when typing something into your calculator: • What are you raising to a power? • What are you dividing?

  6. Now You Try: Don’t Forget Your Parentheses • Evaluate the following function when x = -3. f(x) = 3x4 – (2x + 1)2 + 7 • 225 • -261 • -187 • 201

  7. Your Calculator Can Do More than Just Calculate • (2x – 3)(2x + 3) = • 2x2 – 9 • 4x2 – 9 • 4x2 + 9 • 4x2 – 6x – 9 • You have a GRAPHING calculator, so use the graphing function! • You can check to see if two things are the same by seeing if the two graphs are the same. • Graph the given function • Graph the solutions one at a time and see if they overlay the original. If it doesn’t, try the next answer.

  8. Now You Try: Graph Question and Solutions • (-2x + 3)(x – 6) = • 2x2 – 15x – 18 • 2x2 – 9x + 18 • -2x2 – 15x + 18 • -2x2 – 9x – 18

  9. Why Calculate When You Can Estimate? • Divide .00017 by .00038. • 0.447 • 2.235 • 0 • 0.999 • If you have a calculator, great! Use it. But if you don’t, don’t worry. You may not need it. • You don’t always have to find the exact answer. Sometimes you can just approximate it. • If the numerator is bigger than the denominator, the answer will be >1. • If the numerator is smaller than the denominator, the answer will be <1. • If the numerator is close to the same as the denominator, the answer will be ≈1. Which of the answers is less than 1? No calculations were actually needed.

  10. Now You Try: Approximate • Divide 1,053,210 by 1,052,990. • 0.00 • 0.52 • 1.00 • 2.00

  11. There’s No Time Limit, So Work Backwards! • If 8 is ¾ of a number N, then N is… • 6 • 32 • 32/3 • 24 • There’s no time limit on the Accuplacer. So why rush through it? Take your time, and if you can’t figure out where to start, start from the answer and work backwards. • We’re looking for ¾ of N. So let’s use our calculators to find ¾ of each of the answers. • Keep checking till you find one that = 8. 6( ¾ ) = 9/2 32( ¾ ) = 24 ( 32/3 )( ¾ ) = 8

  12. Now You Try: Work Backwards • What percent of 2098 is 15? • 17.1% • 13,986.7% • 7.1% • 0.7%

  13. No Numbers? That’s Ok. Just Make Some Up. • Kim earns x dollars per hour for the first 40 hours she works in a week and 1½ times as much for each hour over 40. If she worked 52 hours last week, how much, in dollars, did she earn? • 52x • 40 + 1½ x • 52x + 1½ x • 58x • Sometimes you can clarify a problem by plugging in some values and seeing what the results would be. • Hint: Use numbers that are easy to work with, but be careful with 0, 1, and 2. • Say Kim earns $1/hr and thus $1.50/hr of overtime. • She worked 40 regular hours and 12 overtime hours. 40($1) + 12($1.50) = $58.00

  14. Now You Try: Try an Example • Elizabeth earned 14 dollars a day at her job. Assuming a 5-day work week, how much did she earn in x weeks? • 14 + x dollars • 14x dollars • 70x dollars • 70 + x dollars

More Related