There appear to be missing decimal points, which I shall assume are after the first zeros:
3 + 4 + 0.2 + 0.01 = 7.21
If there is a missing zero after the 3, it is:
30 + 4 + 0.2 + 0.01 = 34.21
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6 + 3 + 02 + 001 = 6 + 3 + 2 + 1 =12
10 + 3 + .2 + .001 = 13.201the bold is your answer
4+.3+.05+.001+.0002
6+5(.1)+3(.01)+7(.001)
It is already in standard form as written.