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Subtraction by rounding is making the terms simpler to subtract. Turn 18.9 into 19. 0.1 was added, so later 0.1 needs to be subtracted. Now it is 34.4-19.

34.4-19=15.4.

Now subtract the 0.1.

15.4-0.1=15.3

The answer is 15.3.

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Q: What is 34.4-18.9 by rounding?
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