![]() ![]() When using KCF, you flip the numerator and denominator of the second number it would be a mistake to do a sign change when using KCF in this step. When using KCC, you change the sign of the second number in the final step it would be a mistake to forget to do a sign change or flip the numerator and denominator when using KCC in this step. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators. Step 3 for KCC and KCF do completely different things. A common mistake with KCF is to have an addition or subtraction sign in the final expression. A common mistake with KCC is to have a multiplication or division sign in the final expression. Remember that addition and subtraction are opposites, just as multiplication and division are opposites. Here, you change the original operation sign to its opposite operation. Step 2 for both KCC and KCF do nearly the same thing. ![]() A common mistake is to do a sign change in the first step by accident. Here, you keep the first number the same without any sign changes. Step 1 for both KCC and KCF do the exact same thing. KCC can only be used with addition and subtraction problems, while KCF can only be used with multiplication and division problems. First we apply keep-change-flip Keep Change Flip (Division of Fractions) Now, we will evaluate our numerical expression by multiplying the first fraction of three-fifths by the reciprocal of the second fraction. In Step 1 and Step 3 notice how KCF did not change the sign of any numbers because KCF does not involve any sign changes.Īlthough they look the same, KCC and KCF are completely different. Consider the following problem, where we want to divide three-fifths by two-sevenths. KCF is used here to change this division problem into a multiplication problem. Two negative fractions are shown below in a division problem. The division sign became a multiplication sign because both operations are opposites. KCF is used here to change this division problem into a multiplication problem. In Step 2 notice how this division problem did not become an addition or subtraction problem. Two positive fractions are shown below in a division problem. This is the number after the operation sign.
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