3619
67
23 :]
If the digit sum of a number adds up to 9 then it is divisible by 9.
999
204
No. The only digit of 2 is ' 2 '. It adds up to 2.
Assuming that "adds up to" means "its digits add up to" 888
It's a four digit number, 2345
You line up the last numbers and then add it!
Rounding up implies the number is smaller than 1000. However, a number smaller than 1000 cannot be a 4-digit number. So there cannot be such a number. What was said is wrong. The greatest 4 digit number that rounds up is 999.9
It can have up to 5 digits.
Well, honey, let me break it down for you. When you multiply a 4-digit number (ranging from 1000 to 9999) by a 1-digit number (ranging from 0 to 9), the result can be a 3-digit number (ranging from 0 to 8991). So no, the product of a 4-digit number and a 1-digit number is not always a 5-digit number. Math doesn't discriminate, darling.