640
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The prime numbers (factors) of 320 are: 2 and 5
42 x 8 = (40 x 8) + (2 x 8) = 320 + 16 = 336
The way you find this is you change 2 1/2 into a decimal (2.5) and then multiply it by 320, giving you 800.
320
When you multiply 2 negative numbers the answer will be positive, ALWAYS