Subtracting Mixed Fractions and Whole Numbers

The video tutorial from MooMooMath introduces an easy method for subtracting fractions from whole numbers using a relatable pizza story. It explains the concept of rewriting whole numbers as fractions to simplify subtraction. The tutorial provides several examples, including mixed fractions, to demonstrate the method, emphasizing the use of the denominator as a clue for rewriting whole numbers. The approach is designed to be simple enough for mental calculation after practice.

What is the fraction representation of a whole pizza cut into 8 slices?

• 8/1

• 7/8

• 1/8

• 8/8

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CCSS.3.NF.A.1

CCSS.3.NF.A.2B

If you subtract 1/8 from a whole pizza, how many slices are left?

• 8/8

• 7/8

• 6/8

• 1/8

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CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is the first step in the shortcut method for subtracting fractions from whole numbers?

• Multiply the whole number by the denominator

• Divide the whole number by the fraction

• Subtract 1 from the whole number

• Add 1 to the whole number

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

How do you rewrite the number 1 when using the shortcut method for 5 - 3/4?

• 5/5

• 1/1

• 3/3

• 4/4

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CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is the result of 5 - 2/3 using the shortcut method?

• 4 1/3

• 3 2/3

• 4 2/3

• 5 1/3

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CCSS.5.NF.A.1

CCSS.5.NF.A.2

In the example 8 - 9/19, what is the rewritten form of 1?

• 9/9

• 19/19

• 16/16

• 8/8

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CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is the result of 16 - 5/7 using the shortcut method?

• 15 2/7

• 15 5/7

• 14 2/7

• 16 2/7

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CCSS.5.NF.A.1

CCSS.5.NF.A.2

How do you handle a mixed fraction like 8 - 2 4/7?

• Subtract the whole numbers first

• Add the fractions first

• Multiply the fractions

• Divide the fractions

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CCSS.7.NS.A.1C

What is the result of 8 - 2 4/7 using the method described?

• 5 3/7

• 6 3/7

• 5 4/7

• 6 4/7

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CCSS.3.NF.A.1

CCSS.3.NF.A.2B

What is the final step in subtracting a mixed fraction from a whole number?

• Subtract 1 from the result

• Multiply the result by the denominator

• Rewrite the fraction

• Add 1 to the result

Tags

CCSS.3.NF.A.1

CCSS.3.NF.A.2B