# Double-Digit Subtraction!

by
**hkwest**

Last updated 7 years ago

** Discipline: **

Math ** Subject: **

Number Operations
** Grade:**

2

Objectives

IntroductionIn this unit, students will learn about the many facets of double-digit subtraction. Students will use manipulatives like base-ten bloacks.Students will learn about fact-families, how to subtract single-digit numbers from double-digit numbers, and ultimately how to subtract double-digit numbers.

Double-Digit SubtractionHannah West

Assessment

Use related facts to make two-digit number families.

Take apart numbers to make a ten to subtract.

Use models to regroup and find differences.

Subtract one-digit numbers from two-digit numbers.

.Subtract two-digit numbers.

Rewrite a horizontal two-digit subtraction problem vertically before subtracting.

Use addition to check subtraction.

Diagnostic: Students will complete McGraw Hill MyMath Chapter 4: Am I Ready? Pre-test.

Formative: During each lesson, students will be observed and given a reteach or enrichment activity based on their understanding.

Summative: Students will complete the Chapter 4 McGraw Hill MyMath chapter test.

Instructional Plan:By using Direct Instruction, Learning Cycles, technology, manipulatives, foldables, and the McGraw Hill MyMath curriculum, I will teach students the processes of subtracting double-digit numbers. Students will learn how to use repeated calculation and how double-digit subtraction and addition are related.

Example Problems 84 42 62-39 -31 -58

Conclusion:This assignment showed me the importance of well-planned, detail-oriented lessons.Having a lesson that is well thought out, can really help stuents learn.

Reflections:

Students were most successful with double-digit subtraction without regrouping. I think this was due to the fact that we had just finished double-digit addition, and the processes were very similar.

Students were least successful with double-digit subtraction WITH regrouping. The multiple steps and processes to remember were clearly frustrating. Base-ten materials were very helpful.

Teacher Understanding:Chaos can be okay in math, and letting students participate in hands-on, movement activities can greatly enhance understanding of an otherwise complicated topic or process.

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