Question
Find the unit's digit in the product 735x371x1155.
Solution Units digit in (74) =1. Therefore, units digit in (74)
i.e., 732 will be 1. Hence, units digit in
(7)35 = 1x7x7x7 = 3
Again, units digit in (3)4 = 1
Therefore, units digit in the expansion of
(34, 17 = (3) 68 = 1
Units digit in the expansion of
(371) = 1x3x3x3 = 7
and units digit in the expanison of (1135) = 1
Hence, units digit in the expansion of
735 x 371 X1155 = 3 x 7x1 = 1
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