Subtraction to 50 with subtrahends <10
I can subtract numbers to 10 from numbers to 50.
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General
Students learn to subtract numbers to 50 with minuends less than 10.
Standards
2.NBT.B.5
Relevance
It is important for students to learn to subtract numbers to 50 so they can determine how many are left of larger quantities.
Introduction
Start by practicing with a number line to 50 by asking students to write a number from 1 to 50 on a sheet of paper. Then they must form a number line as a class without talking! Then ask students to solve the subtraction problem given on a number line to 30 with a minuend greater than ten.
Development
Start by discussing the importance of subtraction to 50 and then explain how you can subtract when the number crosses ten. The lesson will be presented in visual, abstract and story forms. You can use the blue menu in the bottom right of the page to select the method that best suits your classroom needs. The lesson starts with the visual. By counting blocks, explain subtraction to the students. Ask students to practice subtraction by counting the objects on the board. Then discuss the abstract problems. Explain to students that you can sometimes answer these problems by counting backwards, and you can imagine a number line in your head to help you count. Ask students to practice with the given subtraction problems. Discuss the steps of solving a story problem with the class and then ask students to practice this on their own. With each form, you first explain what is done, then you practice together with the students on the interactive whiteboard and finally ask students to try a set of problems on their own.
Check that students are able to subtract numbers to 50 by asking the following questions:
- Why is it useful to be able to subtract numbers to 50?
- How do you solve a problem like 45-7?
Guided practice
Students start with subtraction problems with visual support, then in the abstract and then practice story problems.
Closing
Ask students to do a visual, abstract, and story subtraction problem. You may have them solve these in groups or pairs.
Teaching tips
You can offer manipulatives such as blocks or a number line to help students solve subtraction problems to 50.
Instruction materials
Optional: blocks or number lines
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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.