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Round off the number to

345.769 - round to 5 s.f.
0.00735 - 2 s.f.
4532000 - 3 s.f.
5.67800 - 1 s.f.
0.0000456887 - 4 s.f.
10000 - 1 s.f.

Please present the picture of your calculation and explanation