Even when you have digits on both sides of the decimal point, subtracting is done as usual.
3.58 4.13 - 1.63 - 3.22 -------- -------- 2.94 .91 4.11 4.22 - 3.25 - 2.34 -------- -------- .86 1.88
Now you get to try a few for yourself.
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