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1300_Sec_13_in_class_filled

# 1300_Sec_13_in_class_filled - 15 18 and 36 Use Finding...

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Math 1300 Section 1.3 Prime numbers Write as a product of prime factors. Example 1: Write each as a product of prime factors. A. 28 B. 32 C. 60 D. 15

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Find the greatest common factor (GCF) of a set of numbers (biggest number that divides into each number in the set) Step 1: Write each number in the set as a product of prime factors. Step 2: The GCF is the product of all prime factors common to every number in the set. Example 2: Find the GCF of each set of numbers. A. 32 and 28 B. 32 and 60 C. 18, 30, 48 D. 27, 18, 45
Use: Reducing fractions Example 3: Reduce: 128 1024 Find the least common multiple (LCM) of a set of numbers (smallest number that all of the numbers in the set divide into) Step 1: Write each number in the set as a product of prime factors Step 2: Take the greatest power on each prime number. Multiply the numbers together. Example 4: Find the LCM of each set of numbers. A. 15 and 27 B. 18 and 36

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C.

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Unformatted text preview: 15, 18, and 36 Use: Finding common denominators Example 5: Find the least common denominator (LCM) for 1 5 7 8 6 10 + + • Adding/Subtracting Fractions Step 1: Find a least common denominator Step 2: Change the numerator of each fraction accordingly Step 3: Add or subtract the numerators; keep the denominators unchanged Step 4: Reduce the answer, if possible Example 6: Work each problem. A. 7 2 18 27 + B. 7 11 15 27 + C. 21 13 16 10-D. 7 5 8 8-• Multiplying Fractions Step 1: Multiply numerators. Multiply denominators Step 2: Reduce the answer, if possible. Example 7: Multiply each. A. 1 2 5 3 × B. 5 2 8 3 × C. 8 35 15 16 × D. 1 10 5 3-× ** 3 2 6 5 4 7 × You can use the cancelling method, if you know how to do it. • Dividing Fractions Step 1: Multiply the first number by the reciprocal of the second number. Step 2: Reduce your answer, if possible. Example 8: Find each answer. A. 3 7 2 6 ÷ B. 4 8 9-÷...
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1300_Sec_13_in_class_filled - 15 18 and 36 Use Finding...

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