Solve the Mixed Number Equation: 5⅔ + ? = 6⅗

Mixed Number Subtraction with Like Denominators

527+?=637 5\frac{2}{7}+?=6\frac{3}{7}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find the unknown
00:04 Arrange the equation so the unknown is on one side
00:23 Convert mixed fractions to fractions
01:05 Subtract with common denominator
01:20 Now convert to mixed fraction
01:27 Break down 8 into 7 plus 1
01:31 Break down into whole number and remainder
01:36 Convert improper fraction to whole number and combine with mixed fraction
01:41 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

527+?=637 5\frac{2}{7}+?=6\frac{3}{7}

2

Step-by-step solution

To solve the given equation 527+?=637 5\frac{2}{7} + ? = 6\frac{3}{7} , follow these steps:

  • Step 1: Convert mixed numbers into improper fractions to clarify the calculation.
  • The mixed number 5275\frac{2}{7} is converted as follows:
    The improper fraction becomes 57+2=3775 \cdot 7 + 2 = \frac{37}{7}.

    The mixed number 6376\frac{3}{7} is converted as follows:
    The improper fraction becomes 67+3=4576 \cdot 7 + 3 = \frac{45}{7}.

  • Step 2: Calculate the difference to find the missing number.
  • Since we need to find what 6376\frac{3}{7} is when 5275\frac{2}{7} is added to it, determine the difference:
    Subtract the fraction 377\frac{37}{7} from 457\frac{45}{7}:
    457377=87\frac{45}{7} - \frac{37}{7} = \frac{8}{7}.

  • Step 3: Convert the resulting improper fraction back to a mixed number.
  • The fraction 87\frac{8}{7} can be converted to the mixed number 1171\frac{1}{7}. This involves dividing 8 by 7, which yields a quotient of 1 with a remainder of 1.

Thus, the missing number is indeed 1171\frac{1}{7}.

The correct choice among the options provided is: 117 1\frac{1}{7}

3

Final Answer

117 1\frac{1}{7}

Key Points to Remember

Essential concepts to master this topic
  • Concept: Missing addend equals difference between sum and known addend
  • Method: Convert to improper fractions: 457377=87 \frac{45}{7} - \frac{37}{7} = \frac{8}{7}
  • Verify: Check that 527+117=637 5\frac{2}{7} + 1\frac{1}{7} = 6\frac{3}{7}

Common Mistakes

Avoid these frequent errors
  • Subtracting whole numbers and fractions separately without proper conversion
    Don't subtract 6 - 5 = 1, then 3/7 - 2/7 = 1/7 to get 1 + 1/7! This ignores proper mixed number arithmetic and gives wrong results. Always convert to improper fractions first, then subtract as single fractions.

Practice Quiz

Test your knowledge with interactive questions

\( 1:\frac{3}{4}= \)

FAQ

Everything you need to know about this question

Why do I need to convert mixed numbers to improper fractions?

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Converting to improper fractions makes the arithmetic much clearer! Instead of juggling whole numbers and fractions separately, you work with single fractions that are easier to add and subtract.

How do I convert a mixed number like 5²⁄₇ to an improper fraction?

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Multiply the whole number by the denominator, then add the numerator: 5 × 7 + 2 = 37. So 527=377 5\frac{2}{7} = \frac{37}{7} . Keep the same denominator!

What if I get confused about which number to subtract from which?

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Remember the equation structure: Known + ? = Total. So ? = Total - Known. Here: ? = 637527 6\frac{3}{7} - 5\frac{2}{7}

How do I convert ⁸⁄₇ back to a mixed number?

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Divide the numerator by the denominator: 8 ÷ 7 = 1 remainder 1. So 87=117 \frac{8}{7} = 1\frac{1}{7} . The quotient becomes the whole number, remainder becomes the new numerator!

Can I solve this without converting to improper fractions?

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Yes, but it's trickier! You'd need to handle borrowing if the fraction part gets negative. Converting to improper fractions is the safest and clearest method.

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