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0

0.40 =

0.40/ 1.00

Cancel down by '10'

0.4/1.0

Cancel down the decimal point

04/10

The 'zero' to the left of '4' is trivial, 'drop it'.

Hence

4/10

Cancel down by '2'

2/5

The fraction in its simplest form .

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lenpollock

Lvl 16
1y ago

What else can I help you with?