Missing Operation Signs: Grade 1 Printable Math Worksheet

This worksheet strengthens students' understanding of the relationship between addition and subtraction. Learners will analyze 8 different equations and select the correct operational sign—either plus or minus—to make the number sentence true. It's a targeted way to build fluency and reinforce the core concepts of basic arithmetic operations for first and second graders.

At a Glance

• Grade: 1 · Subject: Math
• Standard: CCSS.MATH.CONTENT.1.OA.D.7 — Understand the meaning of the equal sign.
• Skill Focus: Identifying the correct operation (+ or -)
• Format: 2 pages · 8 problems · Answer key included · PDF
• Best For: Quick skill check or independent practice
• Time: 5–10 minutes

What's Inside

This two-page PDF includes a single-page worksheet and a full answer key. The student page presents eight problems, each showing an equation with a missing operation. Students choose between the plus (+) and minus (-) symbols to make the equation true. The clean layout and clear instructions allow for immediate student engagement.

Zero-Prep Workflow

This print-and-go worksheet is perfect for substitute plans, homework, or a quick review. Total teacher time is under 5 minutes.

• Print: The single-page PDF is ready to go.
• Distribute: Instructions are on the page, making it a self-guided task for a warm-up or exit ticket.
• Review: Use the included answer key for fast checking.

Standards-Aligned Practice

This worksheet directly targets CCSS.MATH.CONTENT.1.OA.D.7, which requires students to understand the equal sign in equations. It also supports CCSS.MATH.CONTENT.2.OA.B.2 by building fluency. These codes can be copied directly into lesson plans.

Flexible Classroom Use

Use this sheet as a 5-minute warm-up to activate prior knowledge or as an exit ticket to assess understanding of operations. Observe students as they work to spot any hesitation, providing valuable formative data. The task takes about 5-10 minutes to complete.

For First and Second Graders

This resource is ideal for Grade 1 students being introduced to equations. It is also an effective intervention tool for Grade 2 students needing more practice with operational fluency. The simple design is accessible to all learners. Pair this activity with a classroom number line to provide a visual scaffold for students who need extra support.

This worksheet provides focused practice on a critical early math skill: determining the correct operation to make an equation true, a cornerstone of CCSS.MATH.CONTENT.1.OA.D.7. By engaging with these problems, students build a foundational understanding of the inverse relationship between addition and subtraction. Research from the RAND Corporation confirms that early mastery of foundational number sense is a significant predictor of later mathematics achievement (RAND AIRS 2024). The eight problems in this resource offer a concise, effective tool for reinforcing this algebraic thinking. Its clear format and targeted skill practice give students a structured opportunity to demonstrate their understanding of mathematical equality and operational choice, a concept essential for all future learning in the subject.