1.NBT.C.5 Worksheet: Add and Subtract 10 — Grade 1 Ready

This Grade 1 math worksheet helps students mentally find 10 more or 10 less than any two-digit number. By completing these targeted exercises, learners build strong place value understanding and mental calculation fluency. The resource provides immediate feedback to check student understanding of key addition and subtraction concepts before moving to advanced operations.

At a Glance

• Grade: Grade 1 · Subject: Math
• Standard: CCSS.MATH.CONTENT.1.NBT.C.5 — Mentally find 10 more or less than a two-digit number
• Skill Focus: Mental addition and subtraction of 10
• Format: 2 pages · 5 problems · Answer key included · PDF
• Best For: Quick formative assessment and exit tickets
• Time: 5–10 minutes

What's Inside

This printable PDF contains a double-ticket layout on a single page to conserve printing resources, alongside a complete teacher answer key on the second page. The assessment features five distinct tasks: one word problem requiring students to add and subtract 10 from a base number, followed by three direct numerical equations that test mental addition and subtraction agility.

Mastery Evidence

This exit ticket serves as direct evidence of student progress toward standard mastery. Student performance maps to three distinct tiers: Approaching (solving equations with visual aids), Meeting (correctly answering all five mental math problems), and Exceeding (explaining the place value shift in the word problem). Teachers can enter these scores directly into gradebooks or IEP progress notes to track individual growth over time.

Standards Alignment

This resource aligns directly with the primary standard CCSS.MATH.CONTENT.1.NBT.C.5, which requires students to mentally find 10 more or 10 less than a given two-digit number without counting. Additionally, it supports standard CCSS.MATH.CONTENT.1.NBT.C.4 by reinforcing place value concepts during addition. Both standard codes can be copied directly into lesson plans, IEP goals, or district curriculum mapping tools.

How to Use It

Use this worksheet as a formative assessment at the end of your direct instruction lesson on place value. Alternatively, assign it as a warm-up activity during the next day's math rotation to check retention. While students work during the 5 to 10 minute window, observe whether they count on their fingers or immediately adjust the tens digit. This observation helps identify students needing targeted intervention.

Who It's For

This worksheet is designed for first-grade students learning basic place value operations. It offers scaffolded support for struggling learners through clear formatting, while providing quick practice for on-grade students. Pair this exit ticket with a concrete base-ten block activity or a hundred chart anchor chart to support visual learners during instruction.

This math assessment is built to measure student understanding of the CCSS.MATH.CONTENT.1.NBT.C.5 standard, focusing on the plain-English skill of mentally adding and subtracting 10 from two-digit numbers. According to research from EdReports 2024, frequent, targeted formative assessments like exit tickets are critical for identifying student misconceptions in early mathematics. By isolating the mental manipulation of the tens place, this tool prevents students from relying on slow, counting-by-one strategies. The structured layout ensures teachers receive clear, actionable data on student place value understanding within a short instructional window. This evidence-based design supports systematic progress monitoring, allowing educators to adjust their daily lesson plans based on real-time student performance data. The inclusion of a direct answer key ensures rapid grading and immediate feedback cycles in the classroom.