# Mental Math -Subtract and Add by 10 - Lesson for Grade 1, Chapter - Addition and Subtraction 20-100

In the lesson "Mental Math - Subtract and Add by 10," first-grade students embark on an exciting journey to master foundational subtraction and addition skills within the 20-100 number range. This lesson is a critical building block in the "Foundations in Operations Within 100" unit, focusing on enhancing students’ ability to quickly and accurately perform basic arithmetic operations in their minds.

Throughout this lesson, students will learn how to effortlessly add and subtract by 10, a skill that is not only pivotal in solving more complex math problems but also in everyday numerical tasks. The lesson incorporates engaging and interactive activities such as the "Snowball Math Worksheet," "Rocket Math Worksheet," and the "Stolen Cheese Case Maze Worksheet," which are designed to reinforce these concepts through fun and practical applications.

Understanding how to subtract and add by 10 with ease is essential for students as it lays the groundwork for future math success. It improves their numerical fluency, boosts confidence in handling numbers, and prepares them for more challenging mathematical concepts ahead. By mastering this skill, students will be better equipped to tackle real-world problems efficiently, making this lesson an important step in their mathematical journey.

Estimated classroom time: 13 min
Unit: Foundations in Operations Within 100
Click on any activity below to start learning.
1st
4:00 min
Mental Math: Subtracting and Adding by 10
video
2nd
3:00 min
Snowball Math Worksheet
worksheet
3rd
3:00 min
Rocket Math Worksheet
worksheet
4th
3:00 min
Stolen Cheese Case Maze Worksheet
worksheet
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• ### Activity 2 / Snowball Math Worksheet

This super fun snowball fight is one kids can have no matter the weather and they'll be working on their math facts while they do so. Using tens to add and subtract is a useful strategy to build automaticity in math addition and subtraction equations. With this cheery and free PDF worksheet, they'll count on or count back by 10 in order to solve addition and subtraction problems, and to select the correct answers. And these snowballs don't even let them get cold when they're working!

• ### Activity 3 / Rocket Math Worksheet

Watch your little mathematicians take off into outer space as they use this fantastic and fun PDF worksheet to practice adding and subtracting. They'll skip count on or back by 10, and they'll work on strengthening using 10 as a strategy when solving equations for better authenticity. The rockets are brightly colored and engaging and they'll take your students and turn them into math whizzes in no time!

• ### Activity 4 / Stolen Cheese Case Maze Worksheet

Uh-oh! Someone stole the cheese and it's up to your mathematician to help figure out who it was! Was it the guilty-looking dog, the indifferent-looking cat or the obvious suspect mouse? Your student will get to be the detective on the case as he or she skip counts by 10 using traceable lines on this free PDF worksheet to track down the culprit. They'll work on using skip-counting by 10 as a strategy, and they'll have fun solving the important case!