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The answer is: 5 divided by 5/2 = 2
you can break 800 in 2*2*2*2*2*5*5 = 2^5 * 5^2 so its divisible by any combination of multiplying numbers 2,2,2,2,2,5,5 where you can you only one in each combo. so: 1 2 2*2=4 2*2*2=8 2*2*2*2=16 2*2*2*2*2=32 2*5=10 2*2*5=20 2*2*2*5=40 2*2*2*2*5=80 2*2*2*2*2*5=160 2*5*5=50 2*2*5*5=100 2*2*2*5*5=200 2*2*2*2*5*5=400 2*2*2*2*2*5*5=800 5 5*5=25
2 - (-5) = 7
4000000 = 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 5 * 5 * 5 * 5 * 5 * 5 = 28 * 56
5 2/5 = 5 + 2/5 = 5 + (2 ÷ 5) = 5 + 0.4 = 5.4