Printable Adding 10 to a 2-Digit Number Worksheet

This worksheet helps first-grade students master adding 10 to a two-digit number. Through varied exercises, learners strengthen their understanding of place value and build mental math fluency, moving from concrete visual models to abstract problem-solving with confidence.

At a Glance

• Grade: 1 · Subject: Addition
• Standard: CCSS.MATH.CONTENT.1.NBT.C.5 — Mentally find 10 more than a two-digit number.
• Skill Focus: Adding 10 to a 2-digit number
• Format: 3 pages · 24 problems · Answer key included · PDF
• Best For: Reinforcing place value and addition fluency
• Time: 15–25 minutes

What's Inside

This three-page PDF contains 24 addition problems across four sections: Visual Addition with base-ten blocks, a Mental Math Challenge, Column Addition, and Word Problems. A full answer key is included for quick grading, making it a complete, ready-to-use resource.

Skill Progression

The worksheet follows a classic gradual release model.

• Guided Practice: It opens with six problems using base-ten block visuals to build conceptual understanding of place value.
• Supported Practice: Students then tackle fifteen abstract problems, presented as both equations and in column format, to build procedural fluency.
• Independent Practice: The worksheet concludes with three word problems that require students to apply their new skill in context.

Standards Alignment

This worksheet directly aligns with CCSS.MATH.CONTENT.1.NBT.C.5, requiring students to mentally find 10 more than a number. It also supports CCSS.MATH.CONTENT.1.NBT.C.4 (adding multiples of ten). Both standard codes can be copied directly into lesson plans or curriculum maps.

How to Use It

Use this worksheet for independent practice after a lesson, as homework, or in a math center. For a quick formative assessment, observe which students are using place value strategies versus counting by ones during the mental math section. The activity is designed to be completed in 15-25 minutes, fitting easily into any math block.

Who It's For

Designed for first graders, this resource also works for advanced kindergarteners or as review for second graders. To support struggling learners, provide physical base-ten blocks for a hands-on approach. The sheet pairs well with a classroom hundred chart to help visualize the 'jump' of ten.

This worksheet provides targeted practice for CCSS.MATH.CONTENT.1.NBT.C.5, a critical gateway skill in early elementary mathematics. Developing the ability to mentally add 10 more to a number without counting is a key indicator of a student’s grasp of the base-ten system. The worksheet’s design follows a structured progression from concrete to abstract representations, a methodology supported by educational research on effective instruction. According to Fisher & Frey (2014), such a gradual release of responsibility—moving from teacher-led (visual models) to independent application (word problems)—is essential for building student confidence and ensuring lasting skill acquisition. By isolating this specific place value concept, the resource allows teachers to effectively assess and address a foundational component of numerical fluency, which is a strong predictor of future success in more complex mathematical operations.