20
By 'after 8000' it looks like 'greater than 8000' is what you want.So to get multiple of 4, last 2 digits must be a multiple of 4. {This is because 100 and every multiple of 100 are multiples of 4, so you only have to look at the last two digits}.For multiple of 9, digits must sum up to 9 (or multiple of 9). So 8001 sums up to 9, but it's not multiple of 4. 8010 doesn't work either. So let's look at digits sum to 18. We already have 8, so the last 2 digits sum to 10 would work, and the last 2 digits multiple of 4:19 : 1+9 = 10, but not multiple of 4.28 : 2+8 = 10, and yes it's a multiple of 4.8028 is the answer.
64
41.542.443.344.245.146
Multiple of 10 between 599897 and 600011
You may have any number of digits, but your last digit must be ' 9 '.
The first squared number that is a multiple of 10 is three digits.
372 is divisible by 2 because it's even 3 because the sum of its digits is a multiple of 3 4 because the last two digits are a multiple of 4 6 because its an even multiple of 3 372 is not divisible by 5 because it doesn't end in a 5 or 0 9 because its digits do not total a multiple of 9 10 because it doesn't end in a zero.
By 'after 8000' it looks like 'greater than 8000' is what you want.So to get multiple of 4, last 2 digits must be a multiple of 4. {This is because 100 and every multiple of 100 are multiples of 4, so you only have to look at the last two digits}.For multiple of 9, digits must sum up to 9 (or multiple of 9). So 8001 sums up to 9, but it's not multiple of 4. 8010 doesn't work either. So let's look at digits sum to 18. We already have 8, so the last 2 digits sum to 10 would work, and the last 2 digits multiple of 4:19 : 1+9 = 10, but not multiple of 4.28 : 2+8 = 10, and yes it's a multiple of 4.8028 is the answer.
64
28, 91
64
41.542.443.344.245.146
Multiple of 10 between 599897 and 600011
You may have any number of digits, but your last digit must be ' 9 '.
No, because 7x9=63. Also, if you add the digits of 64, you get 10, which is not a multiple of nine.
3
28