Unit Digit Problem: Finding Numbers Ending in Zero

Q: What exactly is a unit digit?

The unit digit is the rightmost digit in any whole number. For example, in the number 347, the unit digit is 7. In 90, the unit digit is 0.

Q: Why are both 90 and 10 correct answers?

Both numbers end in zero! The question asks for numbers whose unit digit is 0, and both $ 90 $ and $ 10 $ satisfy this condition.

Q: Can I choose answer (b) OR answer (c) separately?

Not in this case! The correct choice is specifically "Answers (b) and (c)" because both individual numbers meet the criteria. Always read all options carefully.

Q: What if a number has more than one digit?

No problem! Just look at the last digit on the right. For 1,250, the unit digit is 0. For 9,847, the unit digit is 7.

Q: Are there other numbers that end in zero?

Yes! Any number ending in 0 has a unit digit of zero: 20, 100, 350, 1000, etc. All multiples of 10 end in zero.

Unit Digits with Multiple Number Identification

Select a number whose unit digit is 0.

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Step-by-step written solution

Follow each step carefully to understand the complete solution

Understand the problem

Select a number whose unit digit is 0.

Step-by-step solution

Let's solve the problem step by step:

Step 1: Identify the numbers provided in the choices. The numbers are $7$ , $90$ , and $10$ .
Step 2: Check each number to see if its unit digit is zero.
- For $7$ : The unit digit is $7$ , which is not zero.
- For $90$ : The unit digit is $0$ , which meets the criteria.
- For $10$ : The unit digit is $0$ , which also meets the criteria.
Step 3: According to these findings, both $90$ and $10$ have unit digits of zero.
Step 4: The correct choice that reflects our findings is the option stating, "Answers (b) and (c)," which corresponds to $90$ and $10$ .

Therefore, the solution is Answers (b) and (c), as both numbers have a unit digit of zero.

Final Answer

Answers (b) and (c)

Key Points to Remember

Essential concepts to master this topic

Unit Digit Rule: The rightmost digit of any whole number
Technique: Check each number: 7 ends in 7, 90 ends in 0, 10 ends in 0
Check: Verify both 90 and 10 end in zero, so both answers are correct ✓

Common Mistakes

Avoid these frequent errors

Selecting only one correct answer when multiple exist
Don't choose just answer (b) or just answer (c) = missing half the solution! Both $90$ and $10$ have unit digits of zero. Always check if the question allows multiple correct choices and select all that apply.

Practice Quiz

Test your knowledge with interactive questions

What number do the blue squares below represent?

FAQ

Everything you need to know about this question

What exactly is a unit digit?

The unit digit is the rightmost digit in any whole number. For example, in the number 347, the unit digit is 7. In 90, the unit digit is 0.

Why are both 90 and 10 correct answers?

Both numbers end in zero! The question asks for numbers whose unit digit is 0, and both $90$ and $10$ satisfy this condition.

Can I choose answer (b) OR answer (c) separately?

Not in this case! The correct choice is specifically "Answers (b) and (c)" because both individual numbers meet the criteria. Always read all options carefully.

What if a number has more than one digit?

No problem! Just look at the last digit on the right. For 1,250, the unit digit is 0. For 9,847, the unit digit is 7.

Are there other numbers that end in zero?

Yes! Any number ending in 0 has a unit digit of zero: 20, 100, 350, 1000, etc. All multiples of 10 end in zero.

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