Solve Multiple Operations: 400×(-4)÷(-16)÷(-6) Step-by-Step

Order of Operations with Mixed Sign Division

+400(4):16:6= +400\cdot(-4):-16:-6=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Let's write division as a fraction
00:17 Let's factor 16 into factors 4 and 4
00:27 Let's reduce what we can
00:34 Let's factor 400 into factors 100 and 4
00:41 Let's reduce what we can
00:48 Let's write division as a fraction
00:53 Positive divided by negative always equals negative
00:57 Let's break down 100 into 96 plus 4
01:16 Let's break into whole fraction and remainder
01:22 Let's factor 4 into factors 2 and 2, and 6 into factors 3 and 2
01:27 Let's reduce what we can
01:34 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

+400(4):16:6= +400\cdot(-4):-16:-6=

2

Step-by-step solution

Let's write the exercise in the following form:

400×(4)16:6= \frac{400\times(-4)}{-16}:-6=

Let's factor -16 in the denominator as a multiplication exercise:

400×(4)4×(4):6= \frac{400\times(-4)}{4\times(-4)}:-6=

Let's reduce -4 in both the numerator and denominator and get:

4004:6= \frac{400}{4}:-6=

Let's factor the 100 in the numerator as a multiplication exercise:

100×44:6= \frac{100\times4}{4}:-6=

Let's reduce the 4 in both the numerator and denominator and get:

100:6= 100:-6=

Let's write the exercise as a fraction:

1006= \frac{100}{-6}=

Note that we are dividing a positive number by a negative number, therefore the result must be negative.

Let's factor the 100 as an addition exercise:

96+46= -\frac{96+4}{6}=

Let's write the exercise in the following way:

(966+46)= -(\frac{96}{6}+\frac{4}{6})=

Let's solve the first fraction and in the second fraction let's factor the numerator and denominator as multiplication exercises:

(16+2×22×3)= -(16+\frac{2\times2}{2\times3})=

Let's reduce the 2 in both the numerator and denominator:

(16+23)= -(16+\frac{2}{3})=

Let's pay attention to the appropriate sign since we are multiplying by a negative number:

1623 -16\frac{2}{3}

3

Final Answer

1623 -16\frac{2}{3}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Follow order of operations: multiplication first, then division left to right
  • Technique: Track signs carefully: 400×(-4) = -1600, then divide sequentially
  • Check: Verify final mixed number: 1623=503 -16\frac{2}{3} = -\frac{50}{3}

Common Mistakes

Avoid these frequent errors
  • Ignoring order of operations for division
    Don't divide all numbers at once like (-4)÷(-16)÷(-6) = wrong result! This ignores that division is performed left to right sequentially. Always work step by step: first 400×(-4)=-1600, then -1600÷(-16)=100, finally 100÷(-6).

Practice Quiz

Test your knowledge with interactive questions

What will be the sign of the result of the next exercise?

\( (-2)\cdot(-4)= \)

FAQ

Everything you need to know about this question

Why do we work from left to right for division?

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Division is left-associative, meaning we perform operations in the order they appear from left to right. Think of it like reading - you can't skip around or the meaning changes!

How do I keep track of positive and negative signs?

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Use the sign rules: positive × negative = negative, negative ÷ negative = positive, positive ÷ negative = negative. Write down each step to avoid confusion!

Can I simplify fractions during the calculation?

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Yes! In this problem, we simplified 400×(4)16 \frac{400×(-4)}{-16} by canceling the (-4) terms. This makes calculations easier and reduces errors.

How do I convert an improper fraction to a mixed number?

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Divide the numerator by the denominator: 503=1623 \frac{50}{3} = 16\frac{2}{3} because 50 ÷ 3 = 16 remainder 2. Don't forget the negative sign!

What if I get confused by all the negative signs?

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Take it one step at a time! Count the negative signs: odd number = negative result, even number = positive result. Practice makes perfect.

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