Grade 1 10 More 10 Less — Printable Math Worksheet

This Grade 1 math worksheet helps students master mental math by finding 10 more and 10 less than a given two-digit number. By practicing these foundational base-ten concepts, young learners build the fluency needed for faster addition and subtraction without relying on counting one by one.

At a Glance

• Grade: 1 · Subject: Math
• Standard: CCSS.MATH.CONTENT.1.NBT.C.5 — Mentally find 10 more or 10 less than a number.
• Skill Focus: 10 More and 10 Less
• Format: 1 page · 12 problems · Answer key included · PDF
• Best For: Independent practice and review
• Time: 10–15 minutes

This single-page resource features 12 multiple-choice questions assessing a student's ability to add or subtract ten. The layout is clean, presenting direct equations, phrasing like "What is 10 less than 50?", and simple word problems. A complete answer key is provided to make grading fast.

Zero-Prep Workflow

This worksheet is designed for immediate classroom use with absolutely no teacher preparation required.

• Print (1 minute): Simply download the PDF and print a class set.
• Distribute (1 minute): Hand out the sheets during your math block or place them in a center folder.
• Review (3 minutes): Use the included answer key to quickly check student responses or project it on the board for self-grading.

With a total prep time of under two minutes, this resource is highly suitable for emergency sub plans or quick morning work.

Standards Alignment

This practice sheet is directly aligned to 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 having to count. It also supports early algebraic thinking by introducing simple word problems involving base-ten operations. Both standard codes can be copied directly into lesson plans, IEP goals, or district curriculum mapping tools.

How to Use It

This worksheet works well as independent practice after direct instruction on the hundreds chart. Students can complete the 12 problems in 10 to 15 minutes. Alternatively, use it as a quick formative assessment. As students work, observe whether they count on fingers or successfully use mental math strategies to jump by tens. This helps identify who needs base-ten blocks.

Who It's For

This resource is primarily designed for first-grade students mastering place value and mental math. It also serves as an excellent review tool for second graders at the beginning of the year. For students needing differentiation, provide a physical hundreds chart or base-ten blocks to support their thinking before they transition to purely mental calculations. It pairs perfectly with a direct instruction lesson on place value patterns.

Mastering the ability to mentally calculate 10 more and 10 less is a critical milestone in early elementary mathematics. According to an EdReports 2024 analysis of foundational math curricula, students who develop strong mental math strategies for base-ten operations demonstrate significantly higher proficiency in subsequent multi-digit addition and subtraction tasks. This worksheet directly targets CCSS.MATH.CONTENT.1.NBT.C.5, ensuring learners can mentally find 10 more or 10 less than a number with confidence. By providing targeted, multiple-choice practice, educators can quickly identify misconceptions related to place value. Consistent exposure to these specific problem types reduces cognitive load, allowing young learners to automate basic arithmetic facts. This automated fluency is essential for tackling more complex mathematical reasoning as they progress through primary grades, building a robust foundation for future algebraic concepts.