Curriculum / Math / 2nd Grade / Unit 1: Adding and Subtracting Within 20 / Lesson 2
Math
Unit 1
2nd Grade
Lesson 2 of 15
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Lesson Notes
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Use related facts to add and subtract within 10.
I can use related facts to add and subtract within 10.
The core standards covered in this lesson
2.OA.B.2 — Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers. See standard 1.OA.6 for a list of mental strategies.
The foundational standards covered in this lesson
1.OA.B.4 — Understand subtraction as an unknown-addend problem. For example, subtract 10 - 8 by finding the number that makes 10 when added to 8.
The essential concepts students need to demonstrate or understand to achieve the lesson objective
5-10 minutes
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Suggestions for teachers to help them teach this lesson
Tasks designed to teach criteria for success of the lesson, and guidance to help draw out student understanding
15-25 minutes
Find the missing pair to 10 and write a related addition and subtraction equation.
a. 3 and _____
b. 8 and _____
c. _____ and 6
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For each equation fill in the blank and write one related addition and subtraction sentence.
a. _____ + 9 = 10
b. 4 + _____ = 10
A set of suggested resources or problem types that teachers can turn into a problem set
15-20 minutes
A task that represents the peak thinking of the lesson - mastery will indicate whether or not objective was achieved
A set of linking cubes is shown below. Which 2 equations can be used to describe this picture?
Write 1 addition equation and 1 subtraction equation that relate to the numbers 10, 7, and 3 as shown in the ten frame below.
addition equation: _____= _____+ _____
subtraction equation: _____ - _____ = _____
Daily Word Problems, Warm Ups, and Center Activities are aligned to the content of the unit but not necessarily to the lesson objective, therefore feel free to use them anytime during your school day.
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Use mental math to add and subtract within 10.
Topic A: Adding and Subtracting within 10 and Counting
Solve addition and subtraction equations within 10 using various strategies.
Standards
2.OA.B.2
Count by ones and tens within 200.
2.NBT.A.2
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Topic B: Strategies to Add and Subtract within 20
Use facts to 10 to apply make ten strategy to add within 20.
Solve unknown addend equations within 20.
Relate subtraction to addition to solve within 20.
Subtract within 20 with strategies (going down over ten) Day 1.
Subtract within 20 with strategies (going down over ten) Day 2.
Use doubles facts to solve addition and subtraction problems within 20.
Solve and explain strategies used to solve equations within 20.
Topic C: Story Problems within 20
Represent story problems visually within 20.
2.OA.A.1
Solve and represent story problems using tape diagrams.
Solve add to and take from word problems within 20.
Solve put together and take apart problems within 20.
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