Check the listing for details. Texas Instruments TI-15 Explorer Elementary Calculator w/Cover Solar Powered. Color: Blue, Condition: Pre-owned. Listed at 8.00 USD. Texas Instruments TI-15 Explorer Elementary Calculator w/Cover Solar Powered. Great tool for students in grades 3-6 to develop problem-solving skills and mathematic concepts. Has several different features including flash card mode! Specs from website below. Please see pictures.Built-in functionalityElectronic flashcards: three levels of difficulty using the “level of difficulty” keyChoose from + - x ÷ or find the operationCalculator allows entry of a problemView hints with “guess and check” featureFractions displayed in stacked formatChoose mixed number or improper fraction resultsChoose to simplify fractions to lowest terms automatically or step-by-stepDisplay indicates when fraction needs to be simplifiedConversions between improper fractions and mixed numbersConversions between fractions, decimals and percentCalculator chooses or allows entry of a common factorView factor used to simplifyView up to two entries and results simultaneouslyReview and edit previous entriesView division results as quotients with remainders, fractions or decimalsTwo constant operations: show counters and resultsNegation keyPowers and square rootSymbolic πConvert π to decimalClear last entry or all entries and settingsBackspace and edit capabilitiesCompare numbers and equations including inequalitiesPlace value: thousandths through thousandsRound or fix to whole number or decimal placesEOS Equation Operating System performs operations in M-D-A-S orderUp to 23 levels of parenthesisError recovery capabilitiesAllows memory retention of settings and previous entries