One trillionth = 0.000000000001
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one trillionth
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You would write: 1/4x+1/6y.
753 trillionths in number form is written as 0.000000753. This is because "trillionths" refers to one trillionth, which is (10^{-12}). Thus, 753 trillionths can also be expressed in scientific notation as (7.53 \times 10^{-10}).