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1000 x 2 = 2000
2% of 100 is "2" 2% of 1000 is therfore "20"
2/1000 = 2 ÷ 1000 = 0.002
How about: 800+200 = 1000 or 2*500 = 1000
Triangle numbers are of the form (x^2+x)/2 So the 1000th triangle number is (1000^2+1000)/2 Which is 500500