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Posted by on Tuesday, April 23, 2013 at 5:25pm.

Problem: A receipe for 4 dozen cookies requires 1 1/2 cups of flour. How much flour is needed for 1 dozen?

work: 4 divided by 1 1/2 = 4/1 x 3/2 =
4/1 x 2/3 = 8/3 cups of flour

Can you explain why i don't need to change 4 dozen to 48 and then divide by 1 1/2?

  • 5th grade math (word problems) - , Tuesday, April 23, 2013 at 5:32pm

    It's simpler to work with dozens than with 48. (Too many numbers)

    You know you'll only need one fourth as much flour for one dozen cookies.

    Let's work it this way. Cross multiply and solve for x.

    4 / (1 1/2) = 1 / x

    4x = 1 1/2

    x = (1 1/2) / 4

    x = 3/2 * 1/4

    x = 3/8 cup

  • 5th grade math (word problems) - , Tuesday, April 23, 2013 at 8:12pm

    thanks!

  • 5th grade math (word problems) - , Tuesday, April 23, 2013 at 9:06pm

    You're welcome.

  • 5th grade math (word problems) - , Tuesday, November 1, 2016 at 10:03am

    27

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