Question
Which is greater? Give reason for your answer? $1.431$ 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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