Basic Math Weekly Summary Solutions_week 1 (1).doc

# Basic Math Weekly Summary Solutions_week 1 (1).doc - Weekly...

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Weekly Summary Answers: Week 1 1. Evaluate: 5 + 23.7 + 8.7 + 9.85; please see section 0.5 for further review. Add from left to right. 5 + 23.7 + 8.7 + 9.85 5 + 23.7 = 28.7 , so we get 28.7 + 8.7 + 9.85 Add 28.7 and 8.7 28.7 + 8.7 + 9.85 28.7 +8.7 37 .4 37.4 + 9.85 37.40 +9.85 47 .25 ANSWER: 47.25 2. Evaluate: 7.83 – 5.2; please see section 0.5 for further review. 7.83 - 5.2 0 2.63 ANSWER: 2.63 3. Multiply: 45 * 33 45 x 33 135 + 1350 1485 ANSWER: 1485 4. Write the decimal equivalent of: 5/8 1 1 1 1

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To find the decimal equivalent, we divide 5 by 8: 625 . 000 . 5 8 4.800 .200 .160 .040 .040 .000 ANSWER: 0.625 5. Find the prime factorization of: 360 To find the prime factorization, we repeatedly divide the number by the smallest integer that divides evenly into the number. In this case, we begin by dividing by 2: 360 = 2 * 180 Now, we can divide 180 by 2: 360 = 2 * 2 * 90 Now, we can divide 90 by 2: 360 = 2 * 2 * 2 * 45 Now, we can divide 45 by 3: 360 = 2 * 2 * 2 * 3 * 15 Now, we can divide 15 by 3: 360 = 2 * 2 * 2 * 3 * 3 * 5 ANSWER: 2 * 2 * 2 * 3 * 3 * 5 6. Simplify: 2 3 10 10 ; please see section 0.7 for further review. STEP 1: Since the denominators are the same we can add the numerators and then put that over the common denominator.
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