Combining Like Terms: Solving 0.5x + 7¼x Step-by-Step

Adding Terms with Mixed Number Coefficients

(+0.5x)+(+714x)= (+0.5x)+(+7\frac{1}{4}x)=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:07 Let's start by finding the point zero point five times X on the axis.
00:13 Next, add the expression to the positive, or right, side of the axis.
00:21 Now, we convert the number into a fraction. Easy so far, right?
00:29 Then, multiply by two to have a common denominator.
00:37 Combine the like terms together.
00:48 And just like that, we've solved the problem!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

(+0.5x)+(+714x)= (+0.5x)+(+7\frac{1}{4}x)=

2

Step-by-step solution

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

  • Step 1: Identify the expressions to be combined: +0.5x +0.5x and +714x +7\frac{1}{4}x .
  • Step 2: Convert the mixed number 714 7\frac{1}{4} to a decimal or improper fraction.
  • Step 3: Perform the addition of coefficients.

Now, let's work through each step:
Step 1: We are given the expressions +0.5x +0.5x and +714x +7\frac{1}{4}x . These need to be combined.

Step 2: Convert the mixed number 714 7\frac{1}{4} to a decimal or improper fraction.
As an improper fraction, 714=294 7\frac{1}{4} = \frac{29}{4} .
As a decimal, 714 7\frac{1}{4} can be approximated to 7.25 7.25 .

Step 3: Add the coefficients:
Using decimals: 0.5+7.25=7.75 0.5 + 7.25 = 7.75 .
Using fractions: Convert 0.5 0.5 to 12 \frac{1}{2} and add 12+294 \frac{1}{2} + \frac{29}{4} .

First, convert 12 \frac{1}{2} to have a common denominator with 294 \frac{29}{4} , which is 24 \frac{2}{4} .
Sum these, 24+294=314 \frac{2}{4} + \frac{29}{4} = \frac{31}{4} which simplifies to 734 7\frac{3}{4} .

Thus, (+0.5x)+(+714x)=734x (+0.5x)+(+7\frac{1}{4}x) = 7\frac{3}{4}x .

Therefore, the solution to the problem is 734x 7\frac{3}{4}x .

3

Final Answer

734x 7\frac{3}{4}x

Key Points to Remember

Essential concepts to master this topic
  • Rule: Like terms have identical variable parts that can be combined
  • Technique: Convert 714 7\frac{1}{4} to 294 \frac{29}{4} then add 12+294 \frac{1}{2} + \frac{29}{4}
  • Check: Final answer 734x 7\frac{3}{4}x equals 314x \frac{31}{4}x when converted ✓

Common Mistakes

Avoid these frequent errors
  • Adding coefficients without converting to common form
    Don't add 0.5 + 7¼ directly = confusion with different number formats! This leads to calculation errors and wrong coefficients. Always convert both coefficients to the same format (decimals OR fractions) before adding.

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

Should I convert to decimals or fractions when adding coefficients?

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Either method works! For this problem, fractions are often cleaner: 12+294=314=734 \frac{1}{2} + \frac{29}{4} = \frac{31}{4} = 7\frac{3}{4} . With decimals: 0.5 + 7.25 = 7.75, but converting back to mixed numbers can be trickier.

How do I convert 7¼ to an improper fraction?

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Multiply the whole number by the denominator, then add the numerator: 7×4+1=28+1=29 7 \times 4 + 1 = 28 + 1 = 29 . So 714=294 7\frac{1}{4} = \frac{29}{4} .

What if I get a different answer using decimals versus fractions?

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You should get the same answer! If they're different, check your conversions. 734=7.75 7\frac{3}{4} = 7.75 and 314=7.75 \frac{31}{4} = 7.75 are all equivalent.

Why can't I just add 0.5x + 7x + ¼x separately?

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You're thinking like this is three separate terms, but 714x 7\frac{1}{4}x is actually one term with coefficient 714 7\frac{1}{4} . Don't split mixed numbers apart!

How do I know when terms are 'like terms'?

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Like terms have identical variable parts. Here, both terms have 'x', so they're like terms. 3x 3x and 5x2 5x^2 would NOT be like terms because of different exponents.

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