Number sense Skills: the ability of the fifth graders to understandfractions, numbers and decimal, to recognize their values as relative orabsolute.Where, Number Sense Skills supposed; (1) to analyze and representthe numbers in multiple ways; (2) to use them in a variety of situations(3) to develop multiple relationships between numbers; (4) to predict theresults of mathematical calculations; (5) to make approximations and estimations;and (6) to perform mental arithmetic and solving verbal arithmeticproblems with fractions and decimal numbers.;