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Practice. Practice! This 24-lesson learning unit is packed with 600 sequential computation problems and 48 word problems. The exercises provide oodles of practice doing all sorts of addition from “72 + 32” to “2560 + 6346 + 2939.” The two story problems included at the bottom of each worksheets are sure to keep students on their toes. Example: “The phone company installed 369 phones in June, 250 in July, and 502 in August. How many phones were installed in those three months?” This book is the first in a series.