Nineteen = 9 plus 10 = 9 + 10
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2+2 = 4
9 + (9/9) = 10(99/9) - (9/9) = 10
3.90*10-9 nanometres is exactly 3.90*10-9 nanometres.3.90*10-9 nanometres is exactly 3.90*10-9 nanometres.3.90*10-9 nanometres is exactly 3.90*10-9 nanometres.3.90*10-9 nanometres is exactly 3.90*10-9 nanometres.
(7/9) / (9/10) = (7/9) * (9/10) = 7/10 = 0.7
9 over 10 = 9/10 or 0.9 in decimal