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Update Final_Exam_Study_Sheet.md

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Grade 9/Math/MFM1P1/Final_Exam_Study_Sheet.md
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- Answer: $`\frac{3 \times 7}{6 \times 4} = \frac{21}{24}`$
### Division With Fractions
- To divide 2 fractions, flip the second fraction upside down.
- To divide 2 fractions, flip the second fraction upside down and multiply them togehter.
- Or, in advanced terms, mulitply the first fraction by the reciporocal of the second fraction.
- Given an example: $`\frac{4}{2} \div \frac{6}{9}`$
- First, flip the second fraction upside down: $`\frac{4}{2} \div \frac{9}{6}`$
- Then change the division to a multiply: $`\frac{4}{2} \times \frac{9}{6}`$
- Then multiply the 2 fractions $`\frac{4 \times 9}{2 \times 6} = \frac{36}{12}`$