Well, honey, one less than twenty thousand is nineteen thousand, nine hundred and ninety-nine. It's not rocket science, just basic math. So, there you have it, simple as pie.
10,000 - 20 = 9,980
It is: 20,000 -100 = 19,900
23,000 or 20,000+3,000 or twenty three thousand
yes
twelve
10,000 - 20 = 9,980
It is: 20,000 -100 = 19,900
No.No.No.No.
The smallest three-digit number is 100. To find twenty thousand more than this number, you simply add 20,000 to 100, which gives you 20,100. Therefore, twenty thousand more than the smallest three-digit number is 20,100.
23,000 or 20,000+3,000 or twenty three thousand
21.2
The largest prime number less than twenty is 19. (BTW, I spotted a spelling error in the word twenty, but I assumed you meant twenty.)
20,100
23.9
19
yes
twelve