I am not at all sure how it will help you find 13 times 8!
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8
Since 8 is 2 x 4, 9 x 8 is 2 x 9 x 4
9 time 4 = 36 9 times 8 =72 36+36=72 half of 72 is 36 half of 8 is 4
You can use 2*8 to find 4*8 by solving 2*8, then multiplying it by 2. This is equivalent to 4*8, or 32.
If you say (9-8+5) times 4 you get 24. Hope I could help.