Even when you have digits on both sides of the decimal point, subtracting is done as usual.
3.586 4.331 - 1.232 - 3.220 -------- -------- 2.354 1.111 4.487 4.556 - 3.252 - 2.343 -------- -------- 1.235 2.213
3.335 - 2.223 = 1.112 4.448 - 3.221 = 1.227 3.458 - 2.134 = 1.324 3.997 - 2.102 = 1.895
Now you get to try a few for yourself.