0
To find out if a number is divisible by seven, take the last digit, double it, and subtract it from the rest of the number.
Example: If you had 203, you would double the last digit to get six, and subtract that from 20 to get 14. If you get an answer divisible by 7 (including zero), then the original number is divisible by seven. If you don't know the new number's divisibility, you can apply the rule again. Source~http://mathforum.org/k12/mathtips/division.tips.html But with incrediby large numbers you're just better off just dividing to see.
Wiki User
∙ 15y ago
Add your answer:
Earn +20 pts
Is 27 divisible by 3?
27 is divisible by three because the sum of 2 and 7 is divisible by three. However, this trick only works with the numbers 3 and 9. 27 divided by 3 is 9.
What number is divisible by 3 1324 or 2463?
2463. The trick is that a number is divisible by 3 if and only if the sum of its digits is divisible by 3. 1+3+2+4 = 10 (not divisible by 3), while 2+4+6+3 = 15 (divisible by 3).
Is 7 divisible by 3?
no 7 is not divisible by 3 wish it was
What is 207 divisible by?
This is an easy one, if you know a little trick -> add up the digits ! 2 + 0 + 7 = 9. Is this divisible by 3 ? Yes ! then 207 is divisible by three. Divide it, you get 69. Add the digits = 15, also divisible by 3. Divide again, you get 23. So, 207 is divisible by 3 3 23.
What is the smallest number divisible by 1 3 5 7 9?
Well, everything is divisible by 1. If something is divisible by 9, then its divisible 3 so you dont need to worry about those two. It's 315.
What is the factor trick for 7?
If you double the last digit and subtract it from the rest of the number and the answer is zero or divisible by 7, then the whole number is divisible by 7.
Is seventy four in the four tables?
No. The number 74 is not divisible by 4. One trick is to add the digits of the number and see if it is divisible by four. this trick applies only to the number 4 7+4= 11 11 is not divisible by 4.
Is 27 divisible by 3?
27 is divisible by three because the sum of 2 and 7 is divisible by three. However, this trick only works with the numbers 3 and 9. 27 divided by 3 is 9.
Is 247 divisible by 2 3 5 9 or 10?
Not two ( the number is not even )Not five or ten ( dosent end with zero or five )Not nine ( Trick: 2+4+7=15 ) Not divisible by nineYes Three: 15 is divisible by threeNote: the trick only works with three and nine
are there any tricks for finding the multiples of 7?
If the last digit doubled subtracted from the rest is a multiple of 7, the whole number is divisible by 7.
What number is divisible by 3 1324 or 2463?
2463. The trick is that a number is divisible by 3 if and only if the sum of its digits is divisible by 3. 1+3+2+4 = 10 (not divisible by 3), while 2+4+6+3 = 15 (divisible by 3).
Is 7 divisible to 104?
7 is not divisible by 104 and 104 is not divisible by 7.
Is 119 divisible by 7?
Not only is 119 divisible by 7 but it is evenly divisible by 7.
Is 208 divisible by 7?
No it is not divisible by 7
Is 750 divisible by 3?
Yes, by 250. Here's a trick I use to find out whether a number is divisible by 3. If you add up all the digits of the numbers it may equal a multiple of 3, if it does it's divisible by 3. For example. 750: 7+5+0=12, which is divisible by 3.
Is 7 divisible by 3?
no 7 is not divisible by 3 wish it was
What is 207 divisible by?
This is an easy one, if you know a little trick -> add up the digits ! 2 + 0 + 7 = 9. Is this divisible by 3 ? Yes ! then 207 is divisible by three. Divide it, you get 69. Add the digits = 15, also divisible by 3. Divide again, you get 23. So, 207 is divisible by 3 3 23.
