Multiplying is the same as repeated addition.
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because there the same
it is the same as multiplying by 0.4
Because multiplying or dividing them by the same NON-ZERO number does not alter their ratio.
Multiplying 6.7 and 5.5 is the same as multiplying 0.67 and 55, or 67 and 0.55.
Because doing so is equivalent to multiplying or dividing by x/x, which can be cancelled down to 1.