Solve: Adding (-1/5) and (+3⅓) with Mixed Numbers

Fraction Addition with Mixed Numbers

(15)+(+313)= (-\frac{1}{5})+(+3\frac{1}{3})=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:05 Let's start by solving the problem.
00:10 First, find the point on the axis.
00:15 To make a connection, move in the positive direction on the axis.
00:33 Next, multiply each fraction by the second denominator to get a common denominator.
00:39 Now, let's calculate the result.
00:50 And that's how we find the solution to the problem!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

(15)+(+313)= (-\frac{1}{5})+(+3\frac{1}{3})=

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Convert 313 3\frac{1}{3} to an improper fraction.
  • Step 2: Find a common denominator for 15 -\frac{1}{5} and the improper fraction.
  • Step 3: Add the fractions.
  • Step 4: Simplify the result, converting it back to a mixed number if necessary.

Now, let's work through each step:

Step 1: Convert 313 3\frac{1}{3} to an improper fraction.
313=3×3+13=103 3\frac{1}{3} = \frac{3 \times 3 + 1}{3} = \frac{10}{3}

Step 2: Find a common denominator for 15 -\frac{1}{5} and 103 \frac{10}{3} .
The least common denominator of 5 and 3 is 15.

Step 3: Express each fraction with the common denominator:
15=315 -\frac{1}{5} = -\frac{3}{15} (multiply the numerator and denominator by 3)
103=5015 \frac{10}{3} = \frac{50}{15} (multiply the numerator and denominator by 5)

Step 4: Add the fractions:
315+5015=3+5015=4715 -\frac{3}{15} + \frac{50}{15} = \frac{-3 + 50}{15} = \frac{47}{15}

Step 5: Simplify 4715 \frac{47}{15} back to a mixed number if needed:
Performing the division, 47 divided by 15 is 3 with a remainder of 2.
Therefore, 4715=3215 \frac{47}{15} = 3\frac{2}{15} .

Therefore, the solution to the problem is 3215 3\frac{2}{15} .

3

Final Answer

3215 3\frac{2}{15}

Key Points to Remember

Essential concepts to master this topic
  • Mixed Numbers: Convert to improper fractions before adding
  • Common Denominator: Use LCD 15 for denominators 5 and 3
  • Verify: Check that 3215=4715 3\frac{2}{15} = \frac{47}{15} converts correctly ✓

Common Mistakes

Avoid these frequent errors
  • Adding whole numbers and fractions separately
    Don't add 3 + (-1/5) = 2⅘! This ignores the fractional part of the mixed number. Always convert mixed numbers to improper fractions first, then find common denominators.

Practice Quiz

Test your knowledge with interactive questions

a is negative number.

b is negative number.

What is the sum of a+b?

FAQ

Everything you need to know about this question

Why can't I just add the whole numbers and fractions separately?

+

Because mixed numbers represent a single value! 313 3\frac{1}{3} means 3 + 1/3, so you must treat it as one complete fraction when adding.

How do I know what the common denominator should be?

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Find the LCD (Least Common Multiple) of your denominators. For 5 and 3, list multiples: 5, 10, 15, 20... and 3, 6, 9, 12, 15. The first match is your LCD!

What if my answer is an improper fraction?

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Convert it back to a mixed number! Divide the numerator by denominator: 4715=47÷15=3215 \frac{47}{15} = 47 ÷ 15 = 3\frac{2}{15} (3 remainder 2).

Why is the answer positive when I'm adding a negative number?

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Because +313 +3\frac{1}{3} is much larger than 15 -\frac{1}{5} ! Think of it as: you have 3⅓ cookies and give away ⅕ cookie - you still have plenty left.

Can I use decimals instead of fractions?

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You could, but fractions give exact answers. Converting 13 \frac{1}{3} to 0.333... creates rounding errors. Stick with fractions for precision!

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