Lesson 7

Adding and Subtracting Multiples of Ten

Est. Class Sessions: 2
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Mathematical Standards

1.OA.A
Represent and solve problems involving addition and subtraction. (1.OA.A.1, 1.OA.A.2)

Standards for Mathematical Practice

MP1.
Make sense of problems and persevere in
solving them.
MP2.
Reason quantitatively.

For many students, counting by tens, adding tens, and subtracting tens are an extension of corresponding work with ones. Similarly, there is a connection between counting on or back by ones and counting on or back by tens. In this activity, students use their knowledge of addition and subtraction with ones to solve problems involving multiples of ten.

Content in this Lesson

  • Representing partitions of numbers using number sentences, 100 Chart, and coins [E2].
  • Representing addition and subtraction using number sentences [E3].
  • Solving addition and subtraction problems involving multiples of ten [E7].
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Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Books

 Student Activity Book

Teacher Resources

 Teacher Guide - digital

Supplies for Student Pairs

20 connecting cubes
desk number line (0–40)

Materials for the Teacher

Display of Marble Orders (Student Activity Book) Page 347–350
Display of 100 Chart (Student Activity Book) Reference
Display of Maria's Marble Mart Master (Teacher Guide)
Unit 11 Assessment Record
Math Facts Class Record
10 trains of connecting cubes, 10 cubes each. See Materials Preparation.
class number line (0–130)
chart paper, optional

Materials Preparation

Prepare Trains of Connecting Cubes. Build 10 trains of connecting cubes, 10 cubes each.

Assessment in this Lesson

Assessment Expectation Assessed
Maria's Bags of Marbles
Student Activity Book
Pages 353–354
E2.
Represent partitions of numbers using links, coins, 100 Chart, and number sentences.
E3.
Represent addition and subtraction using number sentences.
E7.
Solve addition and subtraction problems involving multiples of ten using links, coins, ten frames, and the 100 Chart.
DPP Item Q
Coin Values
Teacher Guide - digital
E6.
Use skip counting to find the value of a collection of pennies, nickels, dimes, and quarters.
DPP Item S
Math Facts Check-In
Teacher Guide - digital
E12.
Demonstrate fluency with the addition facts with sums to ten in Group D.
DPP Item T
Subtraction
Teacher Guide - digital
E13.
Determine the unknown number in an addition or subtraction sentence relating three whole numbers for the facts with sums to ten in Group D.

Vocabulary in this Lesson