Convert Mixed Number Time: 1½ Hours to Minutes

Q: Why do I convert the mixed number to a decimal first?

Converting $ 1\frac{1}{2} $ to 1.5 makes the multiplication easier! You could also think of it as 1 hour + $ \frac{1}{2} $ hour, then convert each part separately: 60 + 30 = 90 minutes.

Q: What if I forget the conversion factor?

Remember: there are 60 minutes in 1 hour. Think about a clock - the minute hand goes around the full circle (60 minutes) in one hour. Write this down as your first step!

Q: Can I leave my answer as a mixed number?

The question asks for minutes, so you need a whole number answer. Mixed numbers work for hours (like $ 1\frac{1}{2} $ hours), but minutes are typically counted as whole numbers.

Q: How do I know if 90 minutes makes sense?

Think practically: $ 1\frac{1}{2} $ hours is 1 hour and 30 minutes. So 60 + 30 = 90 minutes. Always check that your answer matches real-world understanding!

Unit Conversion with Mixed Numbers

$1\frac{1}{2}hr=?min$

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Understand the problem

$1\frac{1}{2}hr=?min$

Step-by-step solution

To solve this problem, we'll follow these steps:

Step 1: Convert the mixed number $1\frac{1}{2}$ into a decimal notation.
Step 2: Use the conversion formula to convert hours into minutes.
Step 3: Calculate the total number of minutes.

Now, let's work through each step:
Step 1: The mixed number $1\frac{1}{2}$ can be converted to the decimal $1.5$ by recognizing that $\frac{1}{2} = 0.5$ . Thus, we have $1.5$ hours.
Step 2: Next, we use the conversion formula: $\text{minutes} = \text{hours} \times 60$ , where the number of hours is $1.5$ .
Step 3: Plugging in the value, we calculate: $\text{minutes} = 1.5 \times 60 = 90$ .

Therefore, the solution to the problem is $90$ minutes.

Final Answer

$90$

Key Points to Remember

Essential concepts to master this topic

Conversion Rule: Multiply hours by 60 to get minutes
Technique: Convert $1\frac{1}{2}$ to 1.5, then 1.5 × 60 = 90
Check: Verify 90 minutes = 1 hour 30 minutes = $1\frac{1}{2}$ hours ✓

Common Mistakes

Avoid these frequent errors

Adding 60 to the mixed number instead of multiplying
Don't add 60 to $1\frac{1}{2}$ to get 61.5 = wrong units and wrong answer! This confuses the conversion process and gives nonsensical results. Always multiply the entire time value by 60 to convert hours to minutes.

Practice Quiz

Test your knowledge with interactive questions

$$ 7min=?hr $$

FAQ

Everything you need to know about this question

Why do I convert the mixed number to a decimal first?

Converting $1\frac{1}{2}$ to 1.5 makes the multiplication easier! You could also think of it as 1 hour + $\frac{1}{2}$ hour, then convert each part separately: 60 + 30 = 90 minutes.

What if I forget the conversion factor?

Remember: there are 60 minutes in 1 hour. Think about a clock - the minute hand goes around the full circle (60 minutes) in one hour. Write this down as your first step!

Can I leave my answer as a mixed number?

The question asks for minutes, so you need a whole number answer. Mixed numbers work for hours (like $1\frac{1}{2}$ hours), but minutes are typically counted as whole numbers.

How do I know if 90 minutes makes sense?

Think practically: $1\frac{1}{2}$ hours is 1 hour and 30 minutes. So 60 + 30 = 90 minutes. Always check that your answer matches real-world understanding!

What if I get a different mixed number in the problem?

The same process works! Convert any mixed number to a decimal first: $2\frac{1}{4}$ = 2.25, then multiply by 60. Or convert each part: 2 hours = 120 minutes, $\frac{1}{4}$ hour = 15 minutes.

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