21/40 is the estimated value of theexpression5/8 -1/10What is Number system?A number system is defined as a system ofwritingto express numbers.The givenexpressionis 5/8 -1/10The terms in the expression are in the form offractions, A fraction represents a part of a whole.To find thevalueof expression firstly find the LCM of 8 and 1040 is the LCM5(5)-1(4)/4025-4/40Thevalueof 25 minus 4 is twenty one.21/40 is the value of theexpression5/8 -1/10Hence, 21/40 is theestimated valueof the expression  5/8 -1/10To learn more onNumber systemclick:brainly.com/question/22046046#SPJ2...

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