Numerically, yes. 2.20=2.2 is a mathematically true statement.
But 2.20 has more significant figures, so it is more precise. This means that if you use it in calculations, you can use more of the resulting digits.
Yes
22% of 220= 22% * 220= 0.22 * 220= 48.4
22 = 10/220 - x
220 - 22 = 198
220 * 22 = 4,840
22, 220 ÷ 10 = 22
220/22 = 10
22
22
198-22y = 220 -22y = 220-198 -22y = 22 y = 22/-22 y = -1
twenty-two 220 / 10 = 22
220/100 = 22/10 so the answer is 22.
The LCM is 220.