Automaticity addition to 20 without crossing tens
Learn to quickly and correctly solve addition problems to 20 without crossing te
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General
Students learn to solve addition problems to 20 without crossing tens quickly and correctly.
Standards
CCSS.Math.Content.2.OA.B.2
Learning objective
Students will be able to quickly and correctly solve addition problems up to 20 in my head without crossing tens.
Introduction
Practice two addition problems with the students by solving them using the visual support provided on the interactive whiteboard.
Instruction
Explain to students what automaticity is, and what automaticity in addition problems means. Tell students that they are going to practice solving addition problems in their head within a given time. The goal is to solve the addition problem within 5, 4, and even 3 seconds. Start by discussing the three problems, the first in 5 seconds, then 4, and finally in 3 seconds. Then ask students to solve the problems within those times and discuss the answers. Tell students that have trouble solving within time that this is something that improves with practice. Then challenge the class to solve three problems in 15 seconds and four seconds within 20 seconds.
Check that students are able to quickly and correctly solve addition problems to 20 without crossing tens by asking the following questions:
- Why is it useful to be able to quickly solve addition problems?
- How can you make sure that you get better and faster at solving addition problems?
Quiz
Students practice with sets of addition problems and are challenged to complete them in progressively less time.
Closing
Ask students to write down the math problems they hear from the interactive whiteboard on a sheet of paper or mini whiteboard and ask them to solve them. Who can solve all 5 correctly in the given time?
Teaching tips
Students who have difficulty solving the addition problems within 5 seconds can first be given the task of practicing addition problems to 20 without any time limits. Then you can start by having them solve a problem in 10 seconds, then 8 seconds, etc.
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About Gynzy
Gynzy is an online teaching platform for interactive whiteboards and displays in schools.
With a focus on elementary education, Gynzy’s Whiteboard, digital tools, and activities make it easy for teachers to save time building lessons, increase student engagement, and make classroom management more efficient.