Session 10 Answers 3 4 5

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Session 11 Answers

Question 3 • 16 =

• • •

• 24 =

• • •

• 67 =

10000 10 20

11000 18 30

• 1000011 • 43 • 103

Question 4 • 1111111111= • 1023 • 3FF • 1777 • 1010101010101010= • 43690 • AAAA • 125252 • 10000001001 • 1033 • 409 • 2011

Working out question 5 • • • •

• •

• • • •

In fact, there is a simple, step-by-step method for computing the binary expansion on the right-hand side of the point. We will illustrate the method by converting the decimal value .625 to a binary representation.. Step 1: Begin with the decimal fraction and multiply by 2. The whole number part of the result is the first binary digit to the right of the point. Because .625 x 2 = 1.25, the first binary digit to the right of the point is a 1. So far, we have .625 = .1??? . . . (base 2) . Step 2: Next we disregard the whole number part of the previous result (the 1 in this case) and multiply by 2 once again. The whole number part of this new result is the second binary digit to the right of the point. We will continue this process until we get a zero as our decimal part or until we recognize an infinite repeating pattern. Because .25 x 2 = 0.50, the second binary digit to the right of the point is a 0. So far, we have .625 = .10?? . . . (base 2) . Step 3: Disregarding the whole number part of the previous result (this result was .50 so there actually is no whole number part to disregard in this case), we multiply by 2 once again. The whole number part of the result is now the next binary digit to the right of the point. Because .50 x 2 = 1.00, the third binary digit to the right of the point is a 1. So now we have .625 = .101?? . . . (base 2) . Step 4: In fact, we do not need a Step 4. We are finished in Step 3, because we had 0 as the fractional part of our result there. Hence the representation of .625 = .101 (base 2) . You should double-check our result by expanding the binary representation

Question 5 • 1.25= • 1.01

• 0.5= • 0.1

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