Math Skills: Fractions

Lesson 3: Lesson Three--Greatest Common Factor/Reducing Fractions

Section Three: Answers to

Answers to part 1, guided practice on reducibility of fractions:

1. 13/67 N (both 13 and 67 are prime)
2. 12/86 Y (both are even and divisible by 2)
3. 14/98 Y (both are even and the GCF is 14)
4. 21/87 Y (both are divisible by 3)
5. 45/120 Y (both are divisible by 5)
6. 28/119 Y (both are divisible by 7)
7. 47/99 N (47 is prime)
8. 26/91 Y (GCF = 13)
9. 84/95 N (they are relatively prime--honest!)
10. 90/200 Y (both are even and divisible by 10-just lop off the 0 at the end)

Guided practice to reducing fractions answers:

1. 5/20 = 1/4
2. 32/56 = 4/7
3. 25/30 = 5/6
4. 90/200 = 9/20

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