Question
Which is greater? Give reason for your answer?
1.431 or 1.439
1.431 or 1.439
✓
Answer
1.431 < 1.439
The whole parts, the tenth parts and the hundredth parts are all equal. Comparing the thousandth parts, we have 1 < 9.
Therefore, $1+\frac{4}{10}+\frac{3}{100}+\frac{1}{1000}<1+\frac{1}{4}+\frac{3}{100}+\frac{9}{1000}$
The whole parts, the tenth parts and the hundredth parts are all equal. Comparing the thousandth parts, we have 1 < 9.
Therefore, $1+\frac{4}{10}+\frac{3}{100}+\frac{1}{1000}<1+\frac{1}{4}+\frac{3}{100}+\frac{9}{1000}$
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