Question 117741: Which of the numbers 18, 48, 452, 486 and 844 are divisible by 4?
Please help. My mind is NOT working today..lol Thank you so much.
Found 2 solutions by jim_thompson5910, Edwin McCravy:
Answer by jim_thompson5910(35256)   (Show Source):
You can put this solution on YOUR website! We already know that 18 is not divisible by 4 (you can divide 18/4 to get 4.5 and you can see that 18 is not a multiple of 4).
The number 48 is divisible by 4 since 48/4=12.
Since the number 52 is divisible by 4 (52/4=13), the number 452 is divisible by 4.
Because 86 is not divisible by 4, 486 is not divisible by 4.
Finally, since 44 is divisible by 4, 844 is divisible by 4.
note: All you need to check if a number is divisible by 4 is the last two digits of that number. For example, if I wanted to see if 1,003,485,020 was divisible by 4. I would simply take the last two digits 20 and see if it was divisible by 4. Since 20 is divisible by 4, the number 1,003,485,020 is divisible by 4. For further proof, divide 1,003,485,020/4 to get 250,871,255.
Answer by Edwin McCravy(20056)  (Show Source):
You can put this solution on YOUR website! Which of the numbers 18, 48, 452, 486 and 844 are divisible by 4?
Please help. My mind is NOT working today..lol Thank you so much.
To be divisible by 4,
1. First, the last digit must be even, 0 being considered even.
If that condition is met, then
2. If the last digit is 0, 4, or 8, the next to last digit must
be even, 0 being considered even.
3. If the last digit is 2 or 6, the next to last digit must be odd.
4. It doesn't matter what the other digits are.
18 is not divisible by 4 because of #2
48 is divisible by 4 because of #2
452 is divisible by 4 because of #3
486 is not divisible by 4 because of #3
844 is divisible by 4 because of #2
Edwin
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