# Mental Math -Subtract and Add by 10 - Part 2 - Lesson for Grade 1, Chapter - Addition and Subtraction - less than 20

In the lesson "Mental Math - Subtract and Add by 10 - Part 2", Grade 1 students will delve deeper into the fundamentals of addition and subtraction within the number range of 20, with a clear focus on understanding and applying the concept of adding and subtracting by tens. Through engaging and interactive activities such as the "Adding a Ten Worksheet," "Garden Subtraction Worksheet," "Air Balloon Math," and the use of "Base 10 Blocks," students will strengthen their mental math skills and grasp the importance of place value in arithmetic operations.

The "Air Balloon Math Worksheet" further reinforces this learning by providing practical problems that encourage students to think and solve mathematically. By actively participating in these activities, students will learn to quickly and efficiently add or subtract by tens without relying on physical counting or regrouping methods. This foundational skill is crucial not only for mastering operations within 100 but also as a building block for more complex mathematical operations they will encounter in their academic journey. Learning to mentally manipulate numbers with ease will enhance their number sense, boost their confidence in math, and provide them with tools for problem-solving in real-life situations.

Estimated classroom time: 17 min
Chapter: Addition and Subtraction - less than 20
Unit: Foundations in Operations Within 100
Click on any activity below to start learning.
1st
3:00 min
worksheet
2nd
3:00 min
Garden Subtraction Worksheet
worksheet
3rd
4:00 min
Air Balloon Math
video
4th
3:00 min
Air Balloon Math Worksheet
worksheet
5th
4:00 min
Using Base 10 Blocks to Add and Subtract (Without Regrouping)
Quiz
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• ### Activity 1 / Adding a Ten Worksheet

Learning to add by whole tens is a crucial step for students who are busy building critical mental math skills, as well as forming a foundation for future math concepts. Kids Academy knows that one of the best ways to master this early skill is by offering visual aids to help kids understand the math process behind the addition. Check out this colorful addition worksheet that offers helpful counters in frames to guide children as they add by tens!

• ### Activity 2 / Garden Subtraction Worksheet

Number sentences are difficult to solve if students don’t understand the underlying concept behind the addition and subtraction they complete. Help your kids make sense of the math they learn by offering this cute and colorful garden-themed subtraction worksheet! On each row, your child will find a row or two of vegetables that need to be counted. Read the number sentences, then count the total number of veggies for each problem. Take away ten for each, and count to see how many are left to find the answer!