Divisibility

100 is evenly divisible by (name numbers between 0 & 12).

1, 2, 4, 5, 10

1,000 evenly divisible by (?).

1, 2, 4, 5, 8

If a number ends in 0 and only 0, it is divisible by (?)

10

Add up the odd number digits in the number, then add up the even number digits. Subtract the sum of the evens from the odds. The result should equal 0 or "(?)" (or a multiple of "(?)") If so, then the number is divisible by (?).

11

The alternating difference-sum of its digits is either "0" or a number divisible by (?)

11

Take the last digit and multiply it by 4, them add that to the remaining digits. If this new number is divisible by (?), then so is the original. If the number is still too large, repeat the process until you've simplified it enough to try.

13

The reverse order code for 7's is

132645

If a number ends in 0, 2, 4, 6, or 8, it is divisible by ___.

2

If a number is divisible by 9, it is also divisible by (?)

3

If the sum of a number's digits is divisible by ____, then the whole number is, too!

3, 9

Because we KNOW that 100 and all multiples of 100 are divisible by ___, you only need to ask if the last two digits (tens,ones) are also divisible by (?)

4

If a number is divisible by 8, it is also divisible by (?)

4

If a number ends in (?), you can double it and divide evenly by ten.

5

If a number ends in 0 or (?), then it is divisible by ____.

5

If a number is both even (divisible by 2) AND divisible by 3, then it is also divisible by ____. Why? Because 3 and 2 are factors of ____!

6

Remove the ones digit, double it and subtract it from the remaining number. Repeat the process if necessary until you reach a number evenly divisible by (?) - if at all possible.

7

Reverse the order of the digits. Multiply them successively by the digits 1, 3, 2, 6, 4, 5, repeating if necessary. Add the products. The sum should be divisible by (?)

7

The last three digits of a number over 1000 are divisible by (?)

8

When you divide a number and there are no remainders, you are __________.

Dividing evenly

If a number is divisible by 2, it is also divisible by 8. - True or False?

False

If a number is divisible by 3, it is also divisible by 9. - True or False?

False

If a number is divisible by 4, it is also divisible by 8. - True or False?

False

If at least two factors of number "X" can divide evenly into another number "Y", then "Y" is evenly divisible by "X". - True or False?

False

If the factors of 34,728 include 2, 3, 4, 6, and 8; then 28 is a factor is 34,728. True or False?

False

If a number is divisible by 8, it is also divisible by 2. - True or False?

True

If a number is divisible by 8, it is also divisible by 4. - True or False?

True

If a number is divisible by 9, it is also divisible by 3. - True or False?

True

If at least two factors of number "X" can divide evenly into another number "Y", AND "X" and "Y" are both "> 11", then "Y" is evenly divisible by "X". - True or False?

True

What do you get when you subtract numbers from each other?

difference

Numbers that end in 0, 2, 4, 6, or 8 are called (?)

even

Numbers that end in 1, 3, 5, 7, or 9 are called (?)

odd

What do you get when you add numbers together?

sum