Wiki User
β 13y agoThere are 6.
They are:
15,45,75,51,54,57.
If you want to include negative numbers (i.e. -15 etc...) then you can double the answer.
Wiki User
β 13y agoNone. 3 digit numbers are not divisible by 19 digit numbers.
Best way to work this out: find the highest number below 10,000 that is divisible by 7 (9,996) and divide that by 7 (1,428). 1,428 is the amount of one-, two-, three- and four-digit numbers divisible by 7. Now find the number of one-, two- and three-digit numbers divisible by 7 (which is 994/7 = 142) and subtract this number from 1,428, giving us 1,286.
one 5 all others are divisible by 5 at least
There are 4,500 such numbers. One of them is 5646
There are 4 such numbers (8, 48, 80, 88).
None. 3 digit numbers are not divisible by 19 digit numbers.
No one-digit numbers are divisible by 10. 10 is divisible by 1, 2 and 5.
Best way to work this out: find the highest number below 10,000 that is divisible by 7 (9,996) and divide that by 7 (1,428). 1,428 is the amount of one-, two-, three- and four-digit numbers divisible by 7. Now find the number of one-, two- and three-digit numbers divisible by 7 (which is 994/7 = 142) and subtract this number from 1,428, giving us 1,286.
one 5 all others are divisible by 5 at least
All 2 digit numbers are divisible by 7: it is simply that some of the quotients are not whole numbers. 10/7 = 1 3/7 99/7 = 14 1/7 So the number of 2-digit numbers which are evenly divisible by 7 are 14-1 = 13.
1234
When the last digit is zero. All whole numbers of more than one digit and with a last digit of 0, 2, 4, 5, 6 or 8 are divisible by another number. Numbers ending with the other digits, 1, 3, 7 and 9, might be divisible by another number, and they might not.
10977120 would be one. There are several.
How many two digit numbers are there in which the tens digit is greater than the oneβs digit ?
Only one positive prime number has a 5 in the ones digit. That prime number is 5. All other numbers with a 5 in the ones digit are composite because they will be divisible by 5.
There are many numbers matching this criteria -- 500 to be exact. 1020 is the smallest one. 9996 is the largest.
531 is one of them and that any 3 digit number whose digital sum is 9 is also divisible by 9