A printable worksheet set for 2nd-grade students covering Section D: Add and Subtract. Concepts are adapted from 4th-grade multi-digit math to whole numbers up to 1,000. Includes addition/subtraction strategies, error spotting, zero hero challenges (subtracting across zeros), and real-world word problems. Final version with improved page breaks and math layouts. Final revision fixes digit logic in Lesson 22 and centers vertical math problems.

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