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Place a 1 under the 0.4, thus creating a fraction without changing the value of 0.4 at all [ 0.4 ] [ --- ] [ 1 ] Multiply this decimal fraction by 10/10, which is really the same as multiplying by 1. The answer now is 4 over 10, expressed as : 4 / 10 ths or 2/5 ths, when simplified.
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