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Course: Staging content lifeboat>Unit 14

Lesson 38: Multiplying fractions word problems

Multiplying fractions word problem: muffins

Learn how to solve word problems involving the multiplication of fractions. Watch an example of a real-life scenario where fractions need to be multiplied, and then practice applying this concept to similar problems. Created by Sal Khan and Monterey Institute for Technology and Education.

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• To solve, can't you also do 3/4 divided by 2? 3/4*1/2=3/8, right?
• Yes you can! Dividing by a number is the same as multiplying by its reciprocal. To find the reciprocal of a number we swap the numerator and denominator. Just be careful not to get confused when saying you divide a fraction by something. For example, you might accidentally do this:

``3/4 ÷ 23/(4÷2)3/2``

Which as you know isn't right!
• 1/2 means half?? right or wrong
• Yes 1/2 and half are the same thing. They are both one half.
• 7/24x20/21x9/10=
• how do you know whether you have to add, subtract, divide, or multiply?? Someone help please asap!!
• In worded problems like this, the clue to add, subtract, divide, or multiply comes from a few words in the problem itself

If you see the words sum, altogether or increase in a worded problem, you probably have to do addition. If you see the words difference, decrease or less than, you probably have to do subtraction. If you see the words of, each or product, you probably have to multiply. If you see the words per, average or shared equally, you probably have to divide.

In this worded problem, we see the word "of". This means we have to multiply 1/2 by 3/4. If you do that, the answer is 3/8
• i don't get how to simply
• Let's say your answer is 42/12 you have to cut them in half so the 42 will become 21 and the 12 will be cut in half and be 6 so your answer is 12/6 and you can cut it in half again 12 cut in half is 6 and 6 cut in half is 3 now we have 6/3 and that is 50 percent so we make that a 1/2. Ask more if your still stuck.
• in multiplying fractions do you always have to multiply the denominator all the time or just certain problems?
• The central hotel just hired a new chef . This chef mkes a hot sauce dat uses 1 3/4 tablespoons of chilly powder he needs to increase d recipe by 3 1/2 times how many table spoons of chilly powder should be used?
• You should just multiply the tablespoons the chef uses by the number of times he needs to increase: 1 3/4 x 3 1/2. The answer is 4 3/8.
• what fraction of an houyr is 7 minutes?
• 7/60
• But my Math teacher told me to NEVER multiply the denominator