Solve the Ratio Problem: Converting 1.5:200 to Simplified Form

Ratio to Decimal with Division

1.5:200= \text{1}.5:200=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:04 Convert from division to fraction
00:14 Reduce as much as possible
00:25 According to the number of zeros in the denominator, we'll move the decimal point
00:38 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

1.5:200= \text{1}.5:200=

2

Step-by-step solution

To solve the given problem, we need to divide the decimal number 1.51.5 by 200200.

  • Step 1: Understand the problem setup as 1.5÷2001.5 \div 200.
  • Step 2: Perform the division.

Let's interpret 1.51.5 as the fraction 1510\frac{15}{10} to assist with division:

Rewriting the division, we have:

1.5200=1510200=152000\frac{1.5}{200} = \frac{\frac{15}{10}}{200} = \frac{15}{2000}

Step 3: Now we divide 1515 by 20002000.

First, set up the division: 15÷200015 \div 2000. This is equivalent to finding: 152000\frac{15}{2000}.

Perform the division plant normally or using a calculator:

1. Start by noting the decimal point position. 15.000÷200015.000 \div 2000 essentially. Perform one digit at a time if manual.

2. You calculate 152000=0.0075\frac{15}{2000} = 0.0075 accurately. Be critical with decimal placement!

Therefore, the quotient of dividing 1.51.5 by 200200 is 0.00750.0075.

Hence, the correct answer is 0.00750.0075, which corresponds to choice 22.

3

Final Answer

0.0075 0.0075

Key Points to Remember

Essential concepts to master this topic
  • Rule: Convert ratio a:b by dividing the first by second
  • Technique: Convert 1.5:200 to 1.5 ÷ 200 = 0.0075
  • Check: Multiply result by 200: 0.0075 × 200 = 1.5 ✓

Common Mistakes

Avoid these frequent errors
  • Treating the colon as addition or subtraction
    Don't think 1.5:200 means 1.5 + 200 or 1.5 - 200 = wrong answer! The colon represents a ratio which requires division. Always convert the ratio to division: first number ÷ second number.

Practice Quiz

Test your knowledge with interactive questions

\( \text{0}.07\times10= \)

FAQ

Everything you need to know about this question

What does the colon mean in 1.5:200?

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The colon : in ratios means "compared to" or "for every." To find the decimal value, you divide the first number by the second: 1.5 ÷ 200.

Why is my decimal so small (0.0075)?

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This makes sense! You're dividing a small number (1.5) by a large number (200). When the divisor is much larger than the dividend, the result will be a small decimal.

How do I keep track of decimal places when dividing?

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Set up the division carefully: 1.5÷200=152000=0.0075 1.5 \div 200 = \frac{15}{2000} = 0.0075 . Count zeros carefully - there should be 3 zeros after the decimal point before the 75.

Can I simplify this ratio first?

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Yes! You could simplify 1.5:200 1.5:200 to 3:400 3:400 by multiplying both sides by 2, but the decimal result will be the same: 0.0075.

How do I check if 0.0075 is correct?

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Multiply your answer by 200: 0.0075×200=1.5 0.0075 \times 200 = 1.5 . If you get back the original first number, you're correct!

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