Deciphering decimals! The 24 worksheets in this lesson unit are filled with 300 computation and word problems designed to help students learn to add and subtract decimals. “7.530 + .143 = ?” “The temperature at 4 p.m. was 113.56 degrees. It was 95.78 degrees at 10 p.m. How much cooler was it at 10 p.m.?” Without a doubt, these easy-to-use exercises provide the practice needed to master reading, writing, and computing decimals. An Answer Key is included.