2's
What is the rule for divisibility by 2?
A number is divisible by 2 if it is even (ends in 0, 2, 4, 6, or 8).
What is the rule for divisibility by 3?
A number is divisible by 3 if the sum of its digits is divisible by 3.
What is the rule for divisibility by 5?
A number is divisible by 5 if it ends in 0 or 5.
What is the rule for divisibility by 15?
A number is divisible by 15 if it is divisible by both 3 and 5.
A number is divisible by 15 if it is divisible by both 3 and 5.
What is the divisibility rule for 4?
If the last 2 digits are divisible by 4, the number is divisible by 4.
Give an example of a number divisible by 2.
Answers vary
List three numbers between 50 and 75 that are divisible by 3.
51, 54, 57, 60, 63, 66, 69, 72, 75
Is 47 divisible by 5? Explain.
No, because it does not end in 0 or 5.
Give an example of a number divisible by 15.
30 (or any multiple of 15).
What is the divisibility rule for 8?
If the last 3 digits are divisible by 8, the number is divisible by 8.
What is the smallest even number?
2
Is 123 divisible by 3? Show how you know.
Answer: Yes, because 1 + 2 + 3 = 6, and 6 is divisible by 3.
Yes, because 1 + 2 + 3 = 6, and 6 is divisible by 3.
If a number is divisible by 25, why is it also divisible by 5?
25 is divisible by 5, so any number divisible by 25 is also divisible 5.
List three numbers between 50 and 100 that are divisible by 15.
60, 75, 90
Is divisible by 22,680 divisible by 3, 5, 7, 8, 9 and 15? List ALL that apply.
Yes
Is 84 divisible by 2? Explain why.
Yes, because it is even (ends in 4).
What is the divisibility rule of 9?
If the sum of digits of the number is divisible by 9, then the number is divisible by 9.
List all the factors of 30.
2, 3, 5, 6
What two divisibility rules must a number satisfy to be divisible by 15?
It must be divisible by both 3 and 5.
List the factors of 17.
Only 1 and 17
If a number is divisible by 16 is it divisible by 2? EXPLAIN WHY?
Yes, because 16 is divisible by 2.
If a number is divisible by 6, it is divisible by 2 and 3. Why?
2 and 3 are factors of 6.
Give an example of a number that is divisible by 17 and 5.
85
Is 567,000,000,000 divisible by 2, 3, 6, 7, 9, and/or 15? List ALL that apply.
ALL
List the factors from 2 to 10 that are factors of 504?
2, 3, 4, 6, 7, 8, and 9