Divisibility Rule: If 6 Divides a Number, Must 2 Divide It Too?

Divisibility Rules with Prime Factorization

Will a number divisible by 6 necessarily be divisible by 2?

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Step-by-step video solution

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00:00 Is every number divisible by 6 also divisible by 2?
00:04 For a number to be divisible by 6, it must also be divisible by 2
00:07 Therefore, every number divisible by 6 is also divisible by 2
00:11 And this is the solution to the question

Step-by-step written solution

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1

Understand the problem

Will a number divisible by 6 necessarily be divisible by 2?

2

Step-by-step solution

In order to determine if a number divisible by 6 is also divisible by 2, we first review the divisibility rules:

  • A number is divisible by 6 if it is divisible by both 2 and 3.
  • A number is divisible by 2 if its last digit is even (one of 0, 2, 4, 6, or 8).

Consider a number n n that is divisible by 6. By definition, since 6 itself factors into 2 multiplied by 3, any number divisible by 6 must be divisible by 2 and 3. This means that any number divisible by 6 is automatically divisible by 2 because 2 is a part of its factorization.

Therefore, yes, any number divisible by 6 will necessarily be divisible by 2 as per the rule of divisibility.

Thus, the correct choice is:

  • Choice 1: Yes

This conclusion adheres strictly to divisibility rules and confirms the assertion that being divisible by 6 includes being divisible by 2.

3

Final Answer

Yes

Key Points to Remember

Essential concepts to master this topic
  • Rule: A number divisible by 6 must divide by both 2 and 3
  • Technique: Factor 6 = 2 × 3, so divisibility by 6 requires both factors
  • Check: Any multiple of 6 (like 12, 18, 24) is always even ✓

Common Mistakes

Avoid these frequent errors
  • Thinking divisibility by 6 is separate from divisibility by 2
    Don't treat divisibility by 6 as independent from its factors = missing the connection! This ignores that 6 = 2 × 3, so every multiple of 6 contains factor 2. Always remember that divisibility by a composite number requires divisibility by all its prime factors.

Practice Quiz

Test your knowledge with interactive questions

Determine if the following number is divisible by 3:

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FAQ

Everything you need to know about this question

Why must a number divisible by 6 also be divisible by 2?

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Because 6 = 2 × 3! When a number is divisible by 6, it means 6 goes into it evenly. Since 6 contains the factor 2, that factor 2 must also divide the number.

Can you give me an example to see this clearly?

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Sure! Take 18: it's divisible by 6 because 18 ÷ 6 = 3. Since 18 = 6 × 3 = (2 × 3) × 3 = 2 × 9, we see that 2 divides 18 as well (18 ÷ 2 = 9).

What about other composite numbers like 4 or 8?

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Same principle! If a number is divisible by 4, it must be divisible by 2 (since 4 = 2 × 2). If divisible by 8, it's divisible by both 4 and 2. Composite numbers always pass on their prime factors.

Is this always true for any composite number?

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Yes! This is a fundamental property: if number a divides number b, and c divides a, then c must also divide b. It's called the transitivity of divisibility.

How can I remember this rule?

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Think of it like ingredients in a recipe: if you need 6 cups of something, you're really using 2 groups of 3 cups each. The '2' is always there as part of the '6'!

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