Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
9 Cards in this Set
- Front
- Back
|
An integer is divisible by 2 if:
|
the integer is even.
|
|
|
An integer is divisible by 3 if:
|
the sum of the integer's digits is a multiple of 3.
|
|
|
An integer is divisible by 5 if:
|
the integer ends in 0 or 5.
|
|
|
An integer is divisible by 9 if:
|
the sume of the integer's digits is a multiple of 9.
|
|
|
An integer is divisible by 10 if:
|
the integer ends in 0.
|
|
|
An integer is divisible by 4 if:
|
the integer is divisible by 2 TWICE, or if the last TWO digits are divisible by 4.
|
|
|
An integer is divisible by 6 if:
|
the integer is divisibly by BOTH 2 and 3.
|
|
|
An integer is divisible by 8 if:
|
the integer is divisible by 2 THREE TIMES, or if the LAST THREE digits are divisible by 8.
|
|
|
An integer is divisible by 7 if:
|
Take the last digit in a number.
Double and subtract the last digit in your number from the rest of the digits. Repeat the process for larger numbers. Example: 357 (Double the 7 to get 14. Subtract 14 from 35 to get 21 which is divisible by 7 and we can now say that 357 is divisible by 7. OR: Take the number and multiply each digit beginning on the right hand side (ones) by 1, 3, 2, 6, 4, 5. Repeat this sequence as necessary Add the products. If the sum is divisible by 7 - so is your number. Example: Is 2016 divisible by 7? 6(1) + 1(3) + 0(2) + 2(6) = 21 21 is divisible by 7 and we can now say that 2016 is also divisible by 7. |
