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Verified Answer :

0.6+0.02+0.004 = 0.624
or 
(6 0.1) + (0.01 2) + (0.001 4) =0.624

= times          both are correct ! hope this helps

0.6+0.02+0.004=0.624
(0.16)+(0.012)+(0.0014)=0.624
= times