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Two fifths is reduced to decimal.
Little friend, can't you simply divide?

2/5 equals 2 ÷ 5 =?

0.4 → This is the final remainder, because 5× 4 = 20, so it is divisible.

5√2.0→2 divided by 5 is not enough, so borrow another one later, so add a decimal point after it.

2 0

——

0 → the remainder is 0, which means divisible.

So the final answer is 0.4.

Son, division should be easy to learn. This is the topic of 1 and grade 2. Haha ~