Solve the Expression: 87:(12×(35:(2×12))) Using Order of Operations

Order of Operations with Nested Fractions

87:(12×(35:(2×12)))= 87:(12\times(35:(2\times12)))=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 We'll use the distributive property of multiplication to convert the exercise into a fraction
00:11 We'll put the multiplication inside the fraction to simplify
00:19 This way we can perform reduction easily
00:22 Let's rewrite the exercise with the fraction result
00:27 And convert back to fraction form for convenience
00:41 Since 174 is not divisible by 5, let's write it differently
00:47 Let's break it into two different fractions
00:53 Now we can reduce the first fraction
00:58 This way, it's easier to reach the solution
01:02 And that's the solution!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

87:(12×(35:(2×12)))= 87:(12\times(35:(2\times12)))=

2

Step-by-step solution

Let's first look at the expression in parentheses, we'll write it as a fraction:

(12×(35:(2×12)))= (12\times(35:(2\times12)))=

12×352×12 12\times\frac{35}{2\times12}

Now we get the expression:

87:(12×352×12) 87:(12\times\frac{35}{2\times12})

Let's address the expression in parentheses and move the 12 to the multiplication expression in the numerator:

87:(12×352×12) 87:(\frac{12\times35}{2\times12})

Let's reduce between the 12 in the numerator and denominator:

87:(352) 87:(\frac{35}{2})

Let's solve the fraction expression in parentheses:

35:2=17.5 35:2=17.5

Now we get the expression:

87:17.5=8717.5 87:17.5=\frac{87}{17.5}

Let's multiply both numerator and denominator by 2 to get whole numbers:

87×217.5×2=17435 \frac{87\times2}{17.5\times2}=\frac{174}{35}

Let's convert the 174 in the numerator to a subtraction expression:

175135= \frac{175-1}{35}=

Let's separate the fraction into a subtraction of fractions:

1755135=5135=43435 \frac{175}{5}-\frac{1}{35}=5-\frac{1}{35}=4\frac{34}{35}

3

Final Answer

43435 4\frac{34}{35}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Work from innermost parentheses outward following PEMDAS
  • Technique: Convert division to fractions: 87:(12×35/24) = 87÷(35/2)
  • Check: Verify final mixed number: 4 34/35 × 17.5 = 87 ✓

Common Mistakes

Avoid these frequent errors
  • Skipping the order of operations
    Don't work left to right ignoring parentheses = 87:12×35:2×12 = wrong answer! This violates PEMDAS and gives completely incorrect results. Always solve innermost parentheses first: (2×12) = 24, then (35:24), then multiply by 12.

Practice Quiz

Test your knowledge with interactive questions

\( 100-(5+55)= \)

FAQ

Everything you need to know about this question

Why do I need to work from the inside out?

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The parentheses tell you the exact order! In 87:(12×(35:(2×12))) 87:(12\times(35:(2\times12))) , you must solve (2×12) (2\times12) first, then (35:24) (35:24) , then multiply by 12.

Can I just work left to right?

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No! Order of operations (PEMDAS) requires you to handle parentheses first, then multiplication/division. Working left to right will give you a completely wrong answer.

How do I handle division with fractions?

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Remember that division by a fraction means multiply by its reciprocal. So 87:(35/2)=87×(2/35)=174/35 87:(35/2) = 87 \times (2/35) = 174/35 .

Why convert to a mixed number at the end?

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Mixed numbers like 43435 4\frac{34}{35} are easier to understand than improper fractions. Since 174/35=4+34/35 174/35 = 4 + 34/35 , the mixed form shows the whole and fractional parts clearly.

What if I get stuck with the fraction arithmetic?

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Break it down step by step!

  • First: 2×12=24 2 \times 12 = 24
  • Then: 35:24=35/24 35:24 = 35/24
  • Next: 12×35/24=420/24=35/2 12 \times 35/24 = 420/24 = 35/2
  • Finally: 87:(35/2)=174/35 87:(35/2) = 174/35

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