การลบและการดำเนินการผกผัน แผ่นงานสำหรับ ชั้นประถมศึกษาปีที่ 2

Connect fact families to unknown-number equations and checking. After students solve 14 − 6 = 8, have them write 8 + 6 = 14 and identify what each number represents; then repeat the routine with the unknown in a different position.

Effective practice includes missing-number equations, addition checks for subtraction, and fact-family problems embedded in short word problems. Mix equations such as __ − 7 = 9 and 16 − __ = 9 so students must reason about the relationship rather than follow one pattern.

Watch for students adding the difference to the minuend instead of the subtrahend, or changing an incorrect subtraction answer to make the check appear correct. Their addition check should reconstruct the original whole exactly.

Host a worksheet as a digital quiz on Wayground for class practice, or print the PDF for independent work, math centers, or an off-screen check of understanding. Each worksheet includes a complete answer key, and teachers can grade paper submissions by scanning or capturing them in the Wayground for Teachers app.

Common Core Grade 2 math extends related addition and subtraction facts into missing-number reasoning and multi-digit work. Students move from knowing that 9 + 7 = 16 supports 16 − 7 = 9 to using addition to verify larger subtraction results.

Provide a widely spaced or larger-font version for students who lose track of equation parts, and allow extended time during digital practice. Students ready for enrichment can solve equations with the unknown in varied positions and justify each answer with its inverse equation.

Second graders should know that addition can solve or check subtraction, recognize related facts, and determine missing values in equations. They should be able to explain that the difference plus the amount subtracted equals the starting total.