Answer :

JcAlmighty
Let's simplify each number to tens and units
16 = 10 + 6
34 = 30 + 4

16 * 34 = (10 + 6)(30 + 4)
            = 10 * 30 + 10 * 4 + 6 * 30 + 6 * 4
            = 300 + 40 + 180 + 24
            = 544

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