classify real numbers; graph and order real numbers; write repeating decimals as fractions; simplify roots; estimate roots; add integers using absolute value; subtract positive integers; multiply and divide integers; compare rational numbers; order rational numbers; add and subtract like fractions; add and subtract unlike fractions; add decimals; use absolute value to add rational numbers; subtract decimals; multiply and divide decimals; multiply fractions; multiply fractions with different signs; find the reciprocal; divide fractions