Solve the Fraction Addition: 1/2 + 2/10 Step-by-Step

Fraction Addition with Different Denominators

Solve the following exercise:

12+210= \frac{1}{2}+\frac{2}{10}=

❤️ Continue Your Math Journey!

We have hundreds of course questions with personalized recommendations + Account 100% premium

Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:05 Let's solve this problem together.
00:08 First, multiply the fraction by 5. This helps us find a common denominator.
00:15 Remember, you need to multiply both the top, which is the numerator, and the bottom, the denominator.
00:21 Okay, let's work through these multiplications step by step.
00:26 We'll use this common denominator to add the fractions easily.
00:30 Now, let's carefully calculate the new numerator.
00:34 Great job! And that's the solution to our question.

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Solve the following exercise:

12+210= \frac{1}{2}+\frac{2}{10}=

2

Step-by-step solution

Let's try to find the lowest common denominator between 2 and 10

To find the lowest common denominator, we need to find a number that is divisible by both 2 and 10

In this case, the common denominator is 10

Now we'll multiply each fraction by the appropriate number to reach the denominator 10

We'll multiply the first fraction by 5

We'll multiply the second fraction by 1

1×52×5+2×110×1=510+210 \frac{1\times5}{2\times5}+\frac{2\times1}{10\times1}=\frac{5}{10}+\frac{2}{10}

Now we'll combine and get:

5+210=710 \frac{5+2}{10}=\frac{7}{10}

3

Final Answer

710 \frac{7}{10}

Key Points to Remember

Essential concepts to master this topic
  • LCD Rule: Find lowest common denominator before adding fractions
  • Technique: Convert 12 \frac{1}{2} to 510 \frac{5}{10} by multiplying by 55 \frac{5}{5}
  • Check: 510+210=710 \frac{5}{10} + \frac{2}{10} = \frac{7}{10} - numerators add correctly ✓

Common Mistakes

Avoid these frequent errors
  • Adding numerators and denominators separately
    Don't add 12+210 \frac{1}{2} + \frac{2}{10} as 312 \frac{3}{12} ! This treats fractions like whole numbers and gives completely wrong results. Always find the LCD first, then convert both fractions to equivalent fractions with that denominator.

Practice Quiz

Test your knowledge with interactive questions

Without calculating, determine whether the quotient in the division exercise is less than 1 or not:

\( 5:6= \)

FAQ

Everything you need to know about this question

Why can't I just add 1+2 and 2+10 separately?

+

Because fractions represent parts of a whole! 12 \frac{1}{2} means 1 part out of 2, while 210 \frac{2}{10} means 2 parts out of 10. You need the same-sized parts (same denominator) before you can add them.

How do I find the LCD of 2 and 10?

+

List multiples of each number: 2: 2, 4, 6, 8, 10... 10: 10, 20, 30... The smallest number that appears in both lists is 10, so that's your LCD!

Why do I multiply 1/2 by 5/5?

+

Because 55=1 \frac{5}{5} = 1 , so multiplying doesn't change the value! You need to get from denominator 2 to denominator 10, and 2 × 5 = 10, so multiply top and bottom by 5.

Can I simplify 7/10 further?

+

No, 710 \frac{7}{10} is already in lowest terms! Since 7 and 10 share no common factors except 1, this fraction cannot be simplified.

What if the denominators were harder numbers?

+

Same process! Find the LCD by listing multiples or using prime factorization. For example, LCD of 6 and 8 is 24. The method never changes - just the numbers get bigger.

🌟 Unlock Your Math Potential

Get unlimited access to all 18 Operations with Fractions questions, detailed video solutions, and personalized progress tracking.

📹

Unlimited Video Solutions

Step-by-step explanations for every problem

📊

Progress Analytics

Track your mastery across all topics

🚫

Ad-Free Learning

Focus on math without distractions

No credit card required • Cancel anytime

More Questions

Click on any question to see the complete solution with step-by-step explanations