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2-Digit Minus 1-Digit Numbers; No Regrouping

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Understanding Basic Subtraction in 1st Grade

Subtraction is a foundational math skill that 1st grade students begin to master as they develop number sense and fluency with basic operations. This particular lesson focuses on subtracting a 1-digit number from a 2-digit number, without the need for regrouping. These types of problems help children understand the relationship between numbers and build confidence in working with values up to 100. Students use this skill daily—whether subtracting stickers, snacks, or coins—making it an essential part of everyday problem-solving.

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How Subtraction Without Regrouping Is Taught

In the elementary classroom, teachers introduce subtraction without regrouping through simple, clear examples and guided practice. Students often start by using visual aids like counters, number lines, and ten-frames to understand how subtraction works conceptually. Once they grasp the basics, they move on to solving subtraction problems through written methods. This 1st grade math skill is frequently reinforced through homework or classwork, center-based activities, and small-group instruction, allowing students to gain fluency and accuracy in a structured, supportive setting.

Support Learning with Interactive Lessons and Online Practice

Interactive lessons, like the one offered on I Know It, give students a fun and effective way to sharpen their subtraction skills. This educational game combines skill practice with instant feedback and age-appropriate graphics, making it ideal for both classroom and at-home use. Online learning tools help reinforce subtraction concepts through repetition and variety, supporting elementary teaching strategies. Whether used as part of daily math practice or as a supplemental resource, this online subtraction lesson helps 1st graders build a strong foundation in math while enjoying the learning experience.

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Level

This interactive math lesson is categorized as Level A and will help 1st grade students learn and develop subtraction skills.

Common Core Standard

1.NBT.4, MA.1.NSO.2.5, 1.3A
Number And Operations In Base Ten

Use Place Value Understanding And Properties Of Operations To Add And Subtract.
Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.

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