1 x 800, 2 x 400, 4 x 200, 5 x 160, 8 x 100, 10 x 80, 16 x 50, 20 x 40, 25 x 32
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Half of 10 is 5.So numbers in the range 800 ± 5 round to 800 to the nearest 10, except that numbers exactly half way round up. Thus all numbers greater than or equal to 800 - 5 round up to 800 and all numbers less than 800 + 5 round down to 800,That is all numbers greater than or equal to 795 and less than 805 will round to 800 to the nearest 10.
800 multiplied by 80 is 64,000.
It is: 800*100 = 80,000
125000 x 800 = 100,000,000 (one hundred thousand)
40 x 40 or 1 x 1600 or 2 x 800 or 4 x 400 etc., etc.