What Is 1 2/3 + 1 2/3? Simply Explained

What Is 1 2/3 + 1 2/3? A Complete Guide to Adding Mixed Numbers

Ever found yourself staring at a problem like 1 2/3 + 1 2/3 and wondering where to even start? Also, you're not alone. Mixed numbers — those half-way-between numbers that have a whole part and a fraction part — can trip up even people who are otherwise comfortable with math. The good news? Once you see how it works, this type of problem becomes pretty straightforward.

So what's the answer? 1 2/3 + 1 2/3 equals 3 1/3 (or 10/3 as an improper fraction, or 3.333... as a decimal).

But here's the thing — knowing the answer is only half the battle. Understanding why it's the answer, and being able to solve similar problems on your own, that's where the real value is. Let me walk you through it.

What Are Mixed Numbers, Anyway?

Before we dive into adding them, let's make sure we're on the same page about what 1 2/3 actually is.

A mixed number combines a whole number and a proper fraction. And in this case, 1 2/3 means one whole, plus two-thirds. Visually, think of it as a full pizza (the 1) plus two slices out of a pizza that was cut into three equal pieces (the 2/3).

You can also write 1 2/3 in other forms:

• As an improper fraction: 5/3 (because 1 = 3/3, and 3/3 + 2/3 = 5/3)
• As a decimal: 1.666... (the 6 repeats forever)

Why Do Mixed Numbers Exist?

Mixed numbers are really just a convenience for reading and writing. Because of that, saying "one and two-thirds" is more intuitive for most people than "five-thirds. " But here's what trips people up: when you need to do math with them — add, subtract, multiply, divide — it's usually easier to convert to an improper fraction first, do the operation, then convert back if needed.

We'll see this in action when we solve 1 2/3 + 1 2/3.

Why Adding Mixed Numbers Matters

Here's the real question: why should you care about knowing how to add mixed numbers like 1 2/3 + 1 2/3?

For starters, this comes up in real life more often than you'd think. Cooking recipes often use mixed numbers — "1 1/2 cups of flour" doubled becomes an addition problem. Which means construction and carpentry involve measurements in feet and inches that work similarly. Even splitting bills or calculating time differences can involve these kinds of calculations.

But beyond the practical applications, there's something else worth mentioning. Understanding how to work with mixed numbers builds a foundation that makes more advanced math feel less intimidating. In real terms, fractions are everywhere in algebra, statistics, and everyday problem-solving. Getting comfortable with them now pays dividends later.

How to Solve 1 2/3 + 1 2/3

Alright, let's get into the actual math. There are a few different ways to approach this, and I'll walk you through each one so you can pick what makes the most sense to you.

Method 1: Add the Parts Separately

The most intuitive way is to break each mixed number into its two parts — the whole number and the fraction — and add each part separately.

Step 1: Add the whole numbers 1 + 1 = 2

Step 2: Add the fractions 2/3 + 2/3 = 4/3

Step 3: Combine your results 2 + 4/3

Now here's where it gets interesting. That means it equals more than one whole. Consider this: 4/3 is an improper fraction — the numerator is bigger than the denominator. Specifically, 4/3 = 1 + 1/3.

So: 2 + 4/3 = 2 + 1 + 1/3 = 3 + 1/3 = 3 1/3

This method works well when you're comfortable thinking about fractions. It keeps the numbers visual and concrete.

Method 2: Convert to Improper Fractions First

Some people prefer to convert everything to improper fractions before adding. Here's how that works:

Step 1: Convert each mixed number to an improper fraction

For 1 2/3:

• Multiply the whole number by the denominator: 1 × 3 = 3
• Add the numerator: 3 + 2 = 5
• Put that over the original denominator: 5/3

So 1 2/3 = 5/3

Step 2: Add the improper fractions 5/3 + 5/3 = 10/3

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Step 3: Convert back to a mixed number 10 ÷ 3 = 3 with a remainder of 1 So that's 3 + 1/3 = 3 1/3

This method is especially useful when you're doing more complex operations like multiplication or division, because the arithmetic with fractions stays cleaner.

Method 3: Use Decimals

If you're comfortable with decimals, you can also solve this problem that way:

1 2/3 ≈ 1.666... 1.666... + 1.666... = 3.333...

The decimal 3.Now, is the same as 3 1/3. 333... The only catch is that you might end up with rounding issues depending on how many decimal places you use.

Common Mistakes People Make

Let me be honest — this is the part where a lot of people mess up. Here's what tends to go wrong:

Adding the numerators without finding a common denominator. In our problem, both fractions already have the same denominator (3), so this wasn't an issue. But if you were adding 1 2/3 + 1 1/2, you'd need to find a common denominator first. Skipping that step is one of the most common fraction errors.

Forgetting to "carry over" when fractions add up to more than one. When 2/3 + 2/3 = 4/3, you can't just leave it as 4/3 in your final answer. You need to recognize that 4/3 is more than one whole and convert it. This is where the "simplify" step matters.

Leaving answers as improper fractions when a mixed number is expected. Both 10/3 and 3 1/3 are correct answers to 1 2/3 + 1 2/3. But depending on context, one might be more appropriate than the other.

Not simplifying the final fraction. If your fraction part ends up as something like 4/8, you should simplify it to 1/2. It's not wrong to leave it unsimplified, but it's considered best practice to reduce fractions to their simplest form.

Practical Tips for Adding Mixed Numbers

Here's what actually works when you're solving these problems:

Write out your work. Don't try to do everything in your head, especially when you're learning. Writing each step helps you catch mistakes and builds muscle memory.

Estimate first. Before you calculate 1 2/3 + 1 2/3, ask yourself: should the answer be around 2? Around 3? Around 4? Since each number is almost 2, the answer should be almost 4. If you get 5, you'll know something went wrong. Estimation is a built-in sanity check.

Know when to use which method. Adding the parts separately works great for simple problems like this one. Converting to improper fractions is better when problems get more complex. Pick the tool that fits the job.

Check your work by solving it a different way. Got 3 1/3 using one method? Try it again using the other method to confirm. This is especially helpful when you're learning.

Frequently Asked Questions

What is 1 2/3 plus 1 2/3 in simplest form?

The answer is 3 1/3. The fraction part (1/3) is already in its simplest form because 1 and 3 have no common factors other than 1.

Can 1 2/3 + 1 2/3 be written as a whole number?

No. The answer is 3 1/3, which is not a whole number. If you're getting a whole number as your answer, double-check your work.

What is 1 2/3 as a decimal?

1 2/3 as a decimal is 1.666... (the 6 repeats infinitely). So 1 2/3 + 1 2/3 = approximately 3.333... (3.3333 with the 3 repeating).

How do you add mixed numbers with different denominators?

First, find a common denominator for the fractions. Here's one way to look at it: if adding 1 2/3 + 1 1/2, you'd convert 2/3 to 4/6 and 1/2 to 3/6, then add: 4/6 + 3/6 = 7/6. Then proceed with the rest of the problem.

Why does 1 2/3 equal 5/3?

Because 1 = 3/3, and 3/3 + 2/3 = 5/3. This is how you convert any mixed number to an improper fraction: multiply the whole number by the denominator, add the numerator, and put the result over the original denominator.

The Bottom Line

Adding 1 2/3 + 1 2/3 gives you 3 1/3. Which means that's the straightforward answer. But what matters more than the answer itself is understanding how to get there — because the methods you use here are the same methods that work for all kinds of mixed number problems, from simple additions to much more complex calculations.

Whether you prefer adding the parts separately or converting to improper fractions first, the key is being comfortable with both the whole numbers and the fractions, and knowing how to handle them when they interact. That's the real skill — and once you've got it, problems like this become second nature.