# Strategies for adding two-digit numbers

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Lesson Plans and Worksheets for Grade 1
Lesson Plans and Worksheets for all Grades

Eureka Math/EngageNY grade 1 module 4 lesson 18 Worksheets

New York State Common Core Math Grade 1 Module 4, Lesson 18
Eureka Math grade 1 module 4 lesson 18 Worksheets (pdf)

Worksheets, examples. solutions, and videos to help Grade 1 students learn how to share and critique peer strategies for adding two-digit numbers.

Common Core Standards: 1.NBT.4

Topic D: Addition of Tens or Ones to a Two-Digit Number

Number Talks
- post a problem
- students solve mentally
- share solution methods
- teacher records on board
Lesson 18 Homework

1. Two students both solved the addition problem below using different methods.
18 + 9
Are they both correct? Why or why not?

2. Another two students solved the same problem using quick tens.
Are they both correct? Why or why not?

3. Circle any student work that is correct.
19 + 6
Fix the student work that was incorrect by making new drawings in the space below.
Choose the correct answers and give a suggestion for improvement.

Try the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.