Solving by distribution method of multiplication on addition –
(i) 138 × 101 = 138 × (100 + 1)
= 138 × 100 + 138 × 1 = 13800 + 138 = 13938
(ii) 125 × 400 = 125 × (300 + 100)
= 125 × 300 + 125 × 100 = 37500 + 12500 = 50000
(iii) 608 × 35 = 608 × (30 + 5)
= 608 × 30 + 608 × 5 = 18240 + 3040 = 21280