This group contains 35 vocabulary cards including the following: algorithm, ballpark estimate, certain, column-addition method, difference, digit, estimate, expanded notation, false number sentence, impossible, lattice method, magnitude estimate, maximum, mean, median, minimum, minuend, mode, number sentence, open number sentence, operation symbol, partial-differences method, partial-products method, partial-sums method, place, place value, range, relation symbols, sample, solution, subtrahend,