Lesson 8

Snack Shop Addition

Est. Class Sessions: 2
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Mathematical Standards

2.NBT.A
Understand place value. (2.NBT.A.2)
2.NBT.B
Use place value understanding and properties of operations to add and subtract. (2.NBT.B.6, 2.NBT.B.8, 2.NBT.B.9)
2.MD.B
Relate addition and subtraction to length. (2.MD.B.6)
2.OA.A
Represent and solve problems involving addition and subtraction. (2.OA.A.1)

Standards for Mathematical Practice

MP1.
Make sense of problems and persevere in
solving them.
MP2.
Reason quantitatively.
MP4.
Model with mathematics.
MP6.
Attend to precision.

Students solve addition word problems using different methods such as expanded form, all-partials, and mental math, and different tools. They make estimations and check the reasonableness of their answers. They learn that a calculator is one of many tools available for checking answers and solving problems.

Content in this Lesson

  • Adding two-digit and three-digit numbers using mental math strategies (e.g., composing and decomposing numbers, counting on) using the 200 Chart, base-ten pieces, and number lines [E3].
  • Adding two-digit and three-digit numbers using paper-and-pencil methods such as expanded form and all-partials [E4].
  • Choosing good tools and strategies for solving addition problems [MPE2].
  • Using estimation to determine the reasonableness of answers [MPE3].
  • Estimating sums using mental math strategies (e.g., rounding using benchmarks, using friendly numbers, composing and decomposing numbers, counting on) [E6].
  • Showing work [MPE5].
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Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Books

 Student Activity Book 200 Chart Reference

Teacher Resources

 Teacher Guide - digital

Supplies for Students

base-ten pieces (21 bits, 20 skinnies, and 3–5 flats)
desk number line (0–100)
calculator
Addition Strategies Menu from Lesson 6, optional

Materials for the Teacher

Display of Addition Strategies Menu (Student Activity Book) Reference
Display of first Shooting Star Snack Shop Children’s Menu (Student Activity Book) Page 373
Unit 7 Assessment Record
Unit 7 Individual Assessment Record
Math Facts Class Record
calculator

Assessment in this Lesson

ASSESSMENT EXPECTATION ASSESSED MATH PRACTICES
EXPECTATION ASSESSED
Many Ways to Solve a Problem
with Feedback Box
Student Activity Book
Pages 379–380
E3.
Add two-digit and three-digit numbers using mental math strategies (e.g., composing and decomposing numbers, counting on) using the 200 Chart, base-ten pieces, and number lines.
E4.
Add two-digit and three-digit numbers using paper-and-pencil methods (e.g., expanded form, all-partials, compact).
E6.
Estimate sums using mental math strategies (e.g., rounding using benchmarks, using friendly numbers, composing and decomposing numbers, counting on).
MPE2.
Find a strategy. I choose good tools and an efficient strategy for solving the problem.
MPE3.
Check for reasonableness. I look back at my solution to see if my answer makes sense. If it does not, I try again.
MPE5.
Show my work. I show or tell how I arrived at my answer so someone else can understand my thinking.
DPP Item AA
Addition Facts Quiz:
Group E
E7.
Demonstrate fluency with the addition facts in Group E (5 + 7, 8 + 4, 8 + 5, 9 + 3, 9 + 4, 9 + 5, 10 + 1, 10 + 2, 10 + 3).
DPP Item CC
Fact Families Quiz:
Group E
E8.
Determine the unknown number in an addition or subtraction sentence relating three whole numbers for the facts in Group E.
Midyear Test
Teacher Guide - digital
See Figure 3 in this lesson.

Vocabulary in this Lesson