1000 × 1000 - 1000 = 1000000 - 1000 = 999000
Alternatively:
1000 × 1000 - 1000 = 1000 × 1000 - 1000 × 1 = 1000 × (1000 - 1) = 1000 × 999 = 999000
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easy, think of 1000 as 1, minus the zeros. 1x6= 6, so 1000x6=6000
There are 1000 meters in a kilometer. That is what the prefix "kilo" means. 0.3 times 1000 meters is 300 meters. 300 meters minus 60 meters is 240 meters.
750 - 1000 = -250
1000 - 425 = 575