Solve Decimal Division: -5.4 ÷ -0.9 Step by Step

Decimal Division with Negative Numbers

Solve the following expression:

5.4:0.9= -5.4:-0.9=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Break down the number into a whole number and remainder
00:10 Convert decimal number to fraction
00:18 Convert whole number to proper fraction
00:25 Add the fractions under a common denominator
00:33 This is the representation of the first number as a fraction
00:38 Convert decimal number to fraction
00:49 Substitute in our exercise
00:58 Division is also multiplication by the reciprocal
01:03 Switch between numerator and denominator
01:07 Simplify what is possible
01:10 Negative times negative always equals positive
01:13 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

Solve the following expression:

5.4:0.9= -5.4:-0.9=

2

Step-by-step solution

Let's begin by breaking down 5.4 into a subtraction exercise as follows:

5.4=50.4 -5.4=-5-0.4

Now let's convert the exercise into a subtraction operation with fractions:

5410=5×1010410=5010410 -5-\frac{4}{10}=-5\times\frac{10}{10}-\frac{4}{10}=-\frac{50}{10}-\frac{4}{10}

Let's proceed to combine the subtraction exercise between the fractions into one fraction:

50410=5410 \frac{-50-4}{10}=-\frac{54}{10}

Let's write the second decimal fraction as a simple fraction:

0.9=910 -0.9=-\frac{9}{10}

Below is the resulting exercise:

5410:910= -\frac{54}{10}:-\frac{9}{10}=

Let's convert the division exercise into a multiplication exercise not forgetting to switch between the numerator and denominator in the second fraction:

5410×109= -\frac{54}{10}\times-\frac{10}{9}=

Finally let's reduce the 10 in both fractions and we should obtain the following:

+549=6 +\frac{54}{9}=6

3

Final Answer

+6 +6

Key Points to Remember

Essential concepts to master this topic
  • Sign Rule: Negative divided by negative always gives positive result
  • Technique: Convert decimals to fractions: -5.4 = -54/10, -0.9 = -9/10
  • Check: Verify by multiplication: 6 × (-0.9) = -5.4 ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting the sign rule for division
    Don't think (-5.4) ÷ (-0.9) = -6 because both numbers are negative! This ignores the fundamental rule that negative ÷ negative = positive. Always remember: same signs give positive results, different signs give negative results.

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 is the answer positive when both numbers are negative?

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The sign rule for division states that when you divide two numbers with the same sign, the result is always positive. Think of it as: negative ÷ negative = positive, just like positive ÷ positive = positive.

Do I really need to convert to fractions?

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Not always! You can divide decimals directly: 5.4÷(0.9)=5.4÷0.9=6 -5.4 ÷ (-0.9) = 5.4 ÷ 0.9 = 6 . Converting to fractions just makes the steps clearer and helps avoid decimal calculation errors.

How do I divide 5.4 by 0.9 without a calculator?

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Think of it as 54 ÷ 9 = 6. When both decimals have the same number of decimal places, you can ignore the decimal points temporarily and divide the whole numbers.

What if the decimal division doesn't work out evenly?

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Sometimes you'll get a repeating decimal or need to round. In this problem, 54÷9 54 ÷ 9 divides evenly to give exactly 6, which is why our answer is a whole number.

How can I check my answer quickly?

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Use multiplication! If 5.4÷(0.9)=6 -5.4 ÷ (-0.9) = 6 , then 6×(0.9) 6 × (-0.9) should equal 5.4 -5.4 . Try it: 6×(0.9)=5.4 6 × (-0.9) = -5.4

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