Solve Complex Expression: 27-(140÷(35/3)+360÷72) Step-by-Step

Order of Operations with Complex Division

27(140:353+360:(89))=? 27-(140:\frac{35}{3}+360:(8\cdot9))=\text{?}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:05 Division is also multiplication by the reciprocal
00:12 Move the division to the denominator
00:19 Factor 140 into 7 and 20
00:25 Factor 35 into 7 and 5
00:30 Factor 360 into 8, 9 and 5
00:42 Reduce what's possible
00:57 Factor 20 into 4 and 5
01:06 Reduce what's possible
01:16 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

27(140:353+360:(89))=? 27-(140:\frac{35}{3}+360:(8\cdot9))=\text{?}

2

Step-by-step solution

The problem asks us to evaluate the expression 27(140:353+360:(89)) 27-(140:\frac{35}{3}+360:(8\cdot9)) .

Following the order of operations (PEMDAS/BODMAS), we first focus on operations within the parentheses.

Calculate each division inside the parentheses:

  • 140:353 140 : \frac{35}{3} means 140÷353 140 \div \frac{35}{3} , which is equivalent to 140×335 140 \times \frac{3}{35} .

Simplifying 140×335 140 \times \frac{3}{35} :

  • Calculate 140÷35=4 140 \div 35 = 4 .
  • Then, multiply 4×3=12 4 \times 3 = 12 .

Now, calculate the second division:

  • 360:(89) 360 : (8 \cdot 9) involves calculating 89=72 8 \cdot 9 = 72 .
  • Then, divide 360÷72=5 360 \div 72 = 5 .

So, our expression within the parentheses simplifies to:

  • 12+5=17 12 + 5 = 17 .

Now go back to the main expression: 2717 27 - 17 .

Calculate the final subtraction:

  • 2717=10 27 - 17 = 10 .

Thus, the solution to the problem is 10 10 .

3

Final Answer

10 10

Key Points to Remember

Essential concepts to master this topic
  • BODMAS Rule: Handle parentheses first, then division/multiplication left to right
  • Technique: Dividing by fraction means multiply by reciprocal: 140÷353=140×335 140 ÷ \frac{35}{3} = 140 × \frac{3}{35}
  • Check: Work backwards: if answer is 10, then 2710=17 27 - 10 = 17 should equal our parentheses ✓

Common Mistakes

Avoid these frequent errors
  • Calculating divisions from left to right without following order of operations
    Don't calculate 27 - 140 first = -113! This ignores the parentheses rule and gives a completely wrong path. Always solve what's inside parentheses completely before doing the final subtraction.

Practice Quiz

Test your knowledge with interactive questions

\( 70:(14\times5)= \)

FAQ

Everything you need to know about this question

Why do I multiply by the reciprocal when dividing by a fraction?

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Division by a fraction is the same as multiplication by its reciprocal. So 140÷353 140 ÷ \frac{35}{3} becomes 140×335 140 × \frac{3}{35} , which is much easier to calculate!

What if I forget to do the parentheses first?

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You'll get the wrong answer! Always remember BODMAS/PEMDAS: Brackets/Parentheses come first. Everything inside must be solved before moving to operations outside.

Can I use a calculator for this problem?

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Yes, but be careful with the order! Enter it exactly as written: 27 - (140 ÷ 35/3 + 360 ÷ 72). Make sure your calculator follows the correct order of operations.

How do I know if 8 × 9 = 72 is right?

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You can double-check: 8×9=(8×10)8=808=72 8 × 9 = (8 × 10) - 8 = 80 - 8 = 72 . Or think of it as 8×9=8×(101)=808=72 8 × 9 = 8 × (10 - 1) = 80 - 8 = 72 .

What's the easiest way to calculate 140 × 3 ÷ 35?

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Look for common factors first! Since 140=4×35 140 = 4 × 35 , you get 4×35×335=4×3=12 \frac{4 × 35 × 3}{35} = 4 × 3 = 12 . The 35s cancel out!

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