2 and a half is mixed fraction. First you make it to proper fraction and you'll get 5 over 2 and then you multiply it to 13. The answer is 32.5.
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13 x 1/2= 13/1 x 1/2= 13/2= 6.5
13
2 x 2 x 13 x 13
Prime factors: 2, 2, 2, 3, 5, 13 Other factors are combinations of the primes, i.e. 2 x 2 = 4 2 x 3 = 6 2 x 2 x 2 = 8 2 x 5 = 10 2 x 2 x 3 = 12 3 x 5 = 15 2 x 2x 5 = 20 2 x 2 x 2 x 3 = 24 2 x 13 = 26 2 x 3 x 5 = 30 3 x 13 = 39 2 x 2 x 2 x 5 = 40 2 x 2 x 13 = 52 2 x 2 x 3 x 5 = 60 5 x 13 = 65 2 x 3 x 13 = 78 2 x 2 x 2 x 13 = 104 2 x 2 x 2 x 3 x 5 = 120 2 x 5 x 13 = 130 2 x 2 x 3 x 13 = 156 3 x 5 x 13 = 195 2 x 2 x 5 x 13 = 260 2 x 2 x 2 x 3 x 13 = 312 2 x 3 x 5 x 13 = 390 2 x 2 x 2 x 5 x 13 = 520 2 x 2 x 3 x 5 x 13 = 780
13 *2 to the second power