Exploring Divisibility: Is Every Even Number a Multiple of 10?

Divisibility Rules with Multiple Conditions

If a number is divisible by 2, is it therefore also divisible by 10?

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Step-by-step video solution

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00:05 Is a number that can be divided by 2, also divisible by 10?
00:09 Let's see an example of a number you can divide by 2.
00:17 Notice that this number doesn't divide evenly by 10.
00:22 Therefore, not all numbers divisible by 2 are divisible by 10.
00:26 And that's how we solve the question!

Step-by-step written solution

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1

Understand the problem

If a number is divisible by 2, is it therefore also divisible by 10?

2

Step-by-step solution

To determine whether a number divisible by 2 is also divisible by 10, we need to analyze each condition separately:

  • Divisibility by 2:
    • A number is divisible by 2 if its last digit is an even number, namely 0, 2, 4, 6, or 8. For example, 12 and 34 are both divisible by 2 because their last digits are 2 and 4, respectively.
  • Divisibility by 10:
    • A number is divisible by 10 if its last digit is 0. For example, 20 and 150 are divisible by 10 because their last digits are 0.

Now, let us examine whether every number that meets the criteria for being divisible by 2 also meets the criteria for being divisible by 10:

  • According to the rules, a number divisible by 2 ends with an even digit (0, 2, 4, 6, or 8). However, only those that end in 0 satisfy the condition for divisibility by 10.
  • This means not every number divisible by 2 will end with a 0. For instance, the number 14 is divisible by 2, but ends with a 4, not 0. Therefore, it is not divisible by 10.

Thus, we conclude that a number divisible by 2 does not necessarily have its last digit as 0, so it is not always divisible by 10.

Therefore, the correct answer to the problem is No.

3

Final Answer

No.

Key Points to Remember

Essential concepts to master this topic
  • Rule: Divisibility by 2 requires even last digit (0,2,4,6,8)
  • Technique: Check 14: divisible by 2 but not 10
  • Check: Every multiple of 10 is even, but not every even number ends in 0 ✓

Common Mistakes

Avoid these frequent errors
  • Assuming divisibility by 2 means divisibility by 10
    Don't think that being divisible by 2 automatically makes a number divisible by 10 = wrong conclusion! Numbers like 12, 14, 16 are divisible by 2 but not 10 because they don't end in 0. Always check each divisibility rule separately.

Practice Quiz

Test your knowledge with interactive questions

Is the number 10 divisible by 4?

FAQ

Everything you need to know about this question

Why isn't every even number divisible by 10?

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Because divisibility by 10 has a stricter rule! A number must end in 0 to be divisible by 10, but even numbers can end in 0, 2, 4, 6, or 8. So numbers like 22 or 36 are even but not divisible by 10.

Are there numbers divisible by 10 but not by 2?

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No! Every number divisible by 10 ends in 0, and 0 is an even digit. This means all multiples of 10 are automatically even, so they're all divisible by 2.

How can I remember the divisibility rule for 10?

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Think of it this way: 10 = 2 × 5. To be divisible by 10, a number needs to be divisible by both 2 and 5. The only way this happens is if the last digit is 0!

What's the difference between 'divisible by' and 'multiple of'?

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They mean the same thing! If 20 is divisible by 10, then 20 is also a multiple of 10. Both terms describe the same mathematical relationship.

Can you give me more examples of even numbers not divisible by 10?

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  • 12 (ends in 2, not 0)
  • 18 (ends in 8, not 0)
  • 24 (ends in 4, not 0)
  • 36 (ends in 6, not 0)

All these are even but not divisible by 10!

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