# Mentally Add/Subtract Using 10 and 100

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If you are looking for ways to help your students improve their mental math skills, this is the lesson for you. Your students can probably already complete basic math problems like 1+1 in their heads, and this lesson will introduce them to patterns they can use to add and subtract larger numbers with ease. The topic is introduced using charts, so students have a visual to aide their understanding. Practice pages, a suggested homework assignment, and a quiz for assessment are included with the lesson. Interactive links are also included so you can add technology to your lesson.

## Mentally Add/Subtract Using 10 and 100 Lesson Plan Includes:

• Full Teacher Guidelines with Creative Teaching Ideas
• Instructional Content Pages about Mentally Add/Subtract Using 10 and 100 Lesson Plan
• Hands-on homework activities giving students practice
• Common Core State Standards

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### Description

If you are looking for ways to help your students improve their mental math skills, this is the lesson for you. Your students can probably already complete basic math problems like 1+1 in their heads, and this lesson will introduce them to patterns they can use to add and subtract larger numbers with ease. The topic is introduced using charts, so students have a visual to aide their understanding. Practice pages, a suggested homework assignment, and a quiz for assessment are included with the lesson. Interactive links are also included so you can add technology to your lesson.

### Classroom Instruction:

1. Begin by asking students if they ever calculate math problems in their head. Explain that they no longer need to write down 1 + 1, because they have memorized it. Tell them that there are patterns we can memorize in math to make our lives easier.
2. While reading the content pages, reinforce vocabulary and give students additional examples of mentally adding and subtracting 10 and 100 problems in order to help them practice the new algorithm. Use the additional resources to enhance understanding.
3. Introduce the notes on mentally adding and subtracting 10 and 100. Have students practice problems with 10 and 100. Use the additional resources to enhance understanding.
4. Have students practice problems using their hundreds board until they feel comfortable.
5. Follow Activity page with students. Have students work individually and have them
record their answers on a separate sheet of paper.
6. Distribute Practice page. Check and review the students’ responses as a class.
7. Distribute the Homework page. Have students work a few problems at the beginning of the next class to reinforce the algorithm.
8. In closing, ask students to explain how to add or subtract 100 from a number.
9. Allow for responses and discussion.

Common Core State Standards:

CCSS.MATH.CONTENT.1.NBT.B.2.b