It depends on the usage. If as a verb, "A is equivalent to B". If as a noun, "A is the equivalent of B".
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Proper???? You have a mixture of numbers and letters. Properly it is 4,000,000 ( numbers). or ' Four million' (words/letters).
6 3/4 as a proper fractionor27/4 as an improper fraction
No. Equivalent fractions applies to proper fractions. Getting an equivalent fractions means getting the same value of the part of a whole.
It is not a proper Roman numeral. If the last character was another I, it would be 423.