Write each of the following numbers in usual form:

(i) 3.74 × 105


(ii) 6.912 × 108


(iii) 4.1253 × 107


(iv) 2.5 × 104


(v) 5.17 × 108


(vi) 1.679 × 109

(i) 3.74 × 105 = = 374 × 10(5-2) = 374 × 103 = 374000


(ii) 6.912 × 108 = = 6912 × 10(8-3) = 6912 × 105 = 691200000


(iii) 4.1253 × 107 = = 41253 × 10(7-4) = 41253 × 103 = 41253000


(iv) 2.5 × 104 = = 25 × 10(4-1) = 25 × 103 = 25000


(v) 5.17 × 106 = = 517 × 10(6-2) = 517 × 104 = 5170000


(vi) 1.679 × 109 = = 1679 × 10(9-3) = 1679 × 106 = 1679000000


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