Regents Strategies: ELIMINATION Ruling out answers that we know are incorrect

What is Elimination? When can we use it? Multiple Choice strategy Cross out the answers that we know are incorrect We can use elimination when we are answering multiple choice questions We have to know some information about the problem, but we might not know the answer

Why use Elimination? What is the probability of choosing the correct answer if we have 4 answer choices? What is the probability of choosing the correct answer if we have 3 answer choices? What is the probability of choosing the correct answer if we have 2 answer choices?

How do we use Elimination? Step 1: Read the question carefully. Step 2: Make a prediction about the answer. Step 3: Cross off any answers that are far from your prediction or answers that do not make sense.

Example Step 1: Read the question carefully It takes Tammy 45 minutes to ride her bike 5 miles. At this rate, how long will it take her to ride 8 miles? (1) 0.89 hour(3) 48 minutes (2) hours(4) 72 minutes

Step 2: Make a prediction Without solving the problem, make a prediction about what the answer might be. What do you know your answer will look like? The problem tells us that she can ride 5 miles in 45 minutes. Therefore, she can go 10 miles in 90 minutes. Since the question asks how long it takes her to go 8 miles, I will predict that it will be a little less than 90 minutes (about minutes)

Step 3: Eliminate answer choices that don’t make sense Go through the answer choices and cross off any answer choices that don’t make sense or are very far away from your prediction. Answer choice (1) doesn’t make sense because it’s less than an hour. Answer choice (2) doesn’t make sense because it’s only 3 minutes longer than the 5 miles bike ride. Now we’re left with choices (3) and (4) and we have a 50% chance of getting the correct answer, even if we just guess.

Example 2 The statement = 2 is an example of the use of which property of real numbers? (1)Associative(2)Additive identity (3) Additive Inverse (4) Distributive