There are 32 tens in 324
320
It is 311.5 which is the number halfway between the two middle numbers.
330 and 340.
20 and 30
What is the value of 2 on 321
50
75
70.21
It is not possible to give a sensible answer to the question. It mentions "these two tens" and then fails to list any tens. It would be useful if you could be bothered to check your questions for completeness before posting them.
If you are rounding it off to the nearest tens place its 320 if its to the nearest hundred than its 300
Only one number between 0 and 60 has a two in the ones and tens place, and it's 22. However, if you are looking for all the numbers between 0 and 60 that have a two in EITHER the ones OR tens place, they are 2, 12, 21, 22, 23, 24, 25, 26, 27, 28, 29, 32, 42, and 52.