Solve Multiplication with Fractions: 10 × 7/9

Whole Number Multiplication with Proper Fractions

10×79= 10\times\frac{7}{9}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Let's move the multiplier to the numerator
00:08 Let's calculate the multiplication
00:11 Now let's convert to a mixed fraction
00:14 Let's break down 70 into 63 and 7
00:21 Let's break down the fraction into a whole number and remainder
00:27 Let's convert from improper fraction to whole number, and combine into a mixed fraction
00:35 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

10×79= 10\times\frac{7}{9}=

2

Step-by-step solution

To solve the problem 10×79 10 \times \frac{7}{9} , we follow these steps:

  • Step 1: Multiply the whole number by the numerator. Calculate 10×7=70 10 \times 7 = 70 .
  • Step 2: Divide this product by the denominator. Calculate 709 \frac{70}{9} .
  • Step 3: If the result is an improper fraction, convert it to a mixed number. Divide 70 by 9, which goes 7 times with a remainder of 7. This can be expressed as the mixed number 779 7\frac{7}{9} .

Let's work through each step:
Step 1: Multiply 10 by 7 to get 70.
Step 2: Divide 70 by 9 to get 7 remainder 7.
Step 3: The proper whole number from the division is 7, with the remainder over the original fraction denominator giving us the final fraction 79 \frac{7}{9} .

Thus, the product 10×79 10 \times \frac{7}{9} is 779 7\frac{7}{9} .

3

Final Answer

779 7\frac{7}{9}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Multiply whole number by numerator, keep same denominator
  • Technique: 10×79=10×79=709 10 \times \frac{7}{9} = \frac{10 \times 7}{9} = \frac{70}{9}
  • Check: Convert improper fraction to mixed number: 709=779 \frac{70}{9} = 7\frac{7}{9}

Common Mistakes

Avoid these frequent errors
  • Multiplying both numerator and denominator by the whole number
    Don't multiply 10 × 7/9 as (10 × 7)/(10 × 9) = 70/90! This gives you 7/9 instead of the correct 77/9. The denominator stays the same when multiplying by a whole number. Always multiply only the numerator by the whole number.

Practice Quiz

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\( 5:\frac{2}{5}= \)

FAQ

Everything you need to know about this question

Why don't I multiply the denominator by 10 too?

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When multiplying a fraction by a whole number, think of the whole number as having denominator 1. So 10×79=101×79=709 10 \times \frac{7}{9} = \frac{10}{1} \times \frac{7}{9} = \frac{70}{9} . Only numerators multiply together!

How do I convert 70/9 to a mixed number?

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Divide the numerator by the denominator: 70 ÷ 9 = 7 remainder 7. The quotient (7) becomes the whole number, and the remainder (7) becomes the new numerator over the same denominator (9).

Can I simplify 7 7/9 further?

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No! Since 7 and 9 share no common factors other than 1, the fraction 79 \frac{7}{9} is already in simplest form. So 779 7\frac{7}{9} is your final answer.

What if I get confused about mixed numbers vs improper fractions?

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Both forms are correct! 709 \frac{70}{9} and 779 7\frac{7}{9} represent the same value. Mixed numbers are usually preferred for final answers because they're easier to understand.

Is there a faster way to do this problem?

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Yes! Think: "10 groups of 7/9". Since 9 groups of 7/9 make 7 whole, 10 groups make 7 whole plus 1 more group of 7/9. So the answer is 779 7\frac{7}{9} !

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