# Add 10 to a 2 digit Number - Lesson for Grade 1, Chapter - Addition and Subtraction 20-100

In the lesson "Add 10 to a 2-digit Number," designed for Grade 1 students, learners will delve into the foundational aspects of addition within the numeric range of 20-100. This lesson is a critical component of the "Foundations in Operations Within 100" unit, laying the groundwork for students to understand and master basic arithmetic operations that are essential for their future mathematical learning.

Through engaging and thematic activities such as the "Stolen Cheese Case Maze Worksheet," "Exploring Outer Space Worksheet," and the "Night Sky Math Worksheet," students will explore the concept of adding 10 to two-digit numbers in a fun and interactive manner. These activities are not only designed to hold the students' interest but also to help them internalize the concept through repetition and application in varied contexts.

Learning to confidently add 10 to a two-digit number is important for several reasons. Firstly, it strengthens mental math skills, enabling students to perform calculations more quickly and accurately. Secondly, it lays a solid foundation for understanding more complex arithmetic operations and concepts, such as place value and regrouping, which are crucial for their future academic success in mathematics.

Estimated classroom time: 9 min
Unit: Foundations in Operations Within 100
Click on any activity below to start learning.
1st
3:00 min
Stolen Cheese Case Maze Worksheet
worksheet
2nd
3:00 min
Exploring Outer Space Worksheet
worksheet
3rd
3:00 min
Night Sky Math Worksheet
worksheet
Share your lesson with students by clicking:
• ### Activity 1 / 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!

• ### Activity 2 / Exploring Outer Space Worksheet

Outer space is a fascinating place. Things don’t go as they do here on Earth, and there are a lot of parts that are still unexplored. In this worksheet, the scientists have discovered a new solar system in a distant galaxy. Explain to your kids what a solar system and a galaxy are. They need your child’s help to count what they found there. Ask your kids to solve the simple mathematical problems, and then trace the lines to the correct answer for each equation.

• ### Activity 3 / Night Sky Math Worksheet

This night sky worksheet will teach your kids some more about math and addition, while also introducing them to the things they see in the night sky. If your child has a telescope, you can ask them to tell you what they see when they look through it at night. Ana, the little girl in this colorful printout, wants to count what she sees in the night sky. She looks up in the sky for two nights in a row. Ask your kids to add what she saw on each night to see how many of each thing she saw in total.