Students recognize, model, read, write, and compare decimals to tenths, connecting them to fractions, number lines, and place value. They identify common U.S. coins and bills, count collections, represent equivalent amounts in cents and decimal dollars to the hundredths, and compare, add, and subtract money amounts to find totals and simple change. They solve one- and two-step money problems involving prices, payments, totals, and differences using equations, models, aligned place values, and reasonable checks.