Write them as improper fractions.
4 and 1/2 = 9/2
2 and 4/5 = 14/5
9/2 x 14/5 = 126/10 or 12.6
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4 and 2 fifths= 4.42 and 1 half= 2.54.4 * 2.5 = 11
6 1/2 = 13/2 13/2 * 4/5 = 52/10 52/10 = 5 1/5
It is 1 and 1/10.
1/2
~0.83