Calculate Daily Restaurant Sales: Multiplying 81 Falafel Pitas by 10 Days

Q: Why do I multiply instead of add when finding totals?

Multiplication is repeated addition! Selling 81 pitas each day for 10 days means 81 + 81 + 81 + ... (10 times). Multiplication $ 81 \times 10 $ gives the same result much faster.

Q: Is there a shortcut for multiplying by 10?

Yes! When multiplying any whole number by 10, simply add one zero to the end. So $ 81 \times 10 = 810 $, $ 45 \times 10 = 450 $, etc.

Q: What if the restaurant sells different amounts each day?

Then you'd need to add each day's sales individually instead of multiplying. Multiplication only works when the daily amount stays the same throughout the period.

Q: What does this problem teach me about real life?

This shows how businesses calculate revenue! Restaurants, stores, and companies multiply daily sales by time periods to find totals and plan inventory.

Basic Multiplication with Powers of Ten

If a restaurant sells 81 falafel pitas per day, then how many are sold in 10 days?

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations

00:00 How many pitas are sold in 10 days?

00:04 Given: number of pitas per day, number of days

00:08 We will use long multiplication to calculate

00:12 We will solve each multiplication separately and then substitute in the long multiplication

00:41 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution

Understand the problem

If a restaurant sells 81 falafel pitas per day, then how many are sold in 10 days?

Step-by-step solution

To solve this problem, we will determine the total number of falafel pitas sold over a 10-day period.

Step 1: Identify the daily sales and the total number of days.
Given: Daily sales = $81$ falafel pitas, Number of days = $10$ .
Step 2: Apply the multiplication formula.
Total Sales = Daily Sales × Number of Days = $81 \times 10$ .
Step 3: Perform the multiplication.
Calculate $81 \times 10 = 810$ .

Therefore, the total number of falafel pitas sold in 10 days is $810$ .

Final Answer

$810$

Key Points to Remember

Essential concepts to master this topic

Rule: Multiplying by 10 adds one zero to whole numbers
Technique: Calculate $81 \times 10 = 810$ by appending zero
Check: Divide result by 10: $810 \div 10 = 81$ matches original ✓

Common Mistakes

Avoid these frequent errors

Adding instead of multiplying the daily amount
Don't add 81 + 10 = 91! This gives the wrong operation and completely incorrect result. When finding totals over multiple days, always multiply daily amount by number of days.

Practice Quiz

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FAQ

Everything you need to know about this question

Why do I multiply instead of add when finding totals?

Multiplication is repeated addition! Selling 81 pitas each day for 10 days means 81 + 81 + 81 + ... (10 times). Multiplication $81 \times 10$ gives the same result much faster.

Is there a shortcut for multiplying by 10?

Yes! When multiplying any whole number by 10, simply add one zero to the end. So $81 \times 10 = 810$ , $45 \times 10 = 450$ , etc.

What if the restaurant sells different amounts each day?

Then you'd need to add each day's sales individually instead of multiplying. Multiplication only works when the daily amount stays the same throughout the period.

How can I check if 810 is reasonable?

Think about it: 81 pitas per day is close to 80. For 10 days, that's about $80 \times 10 = 800$ . Since 810 is close to 800, it makes sense!

What does this problem teach me about real life?

This shows how businesses calculate revenue! Restaurants, stores, and companies multiply daily sales by time periods to find totals and plan inventory.

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