Lesson 16

Tenths and Hundredths, Together

Lesson Purpose

The purpose of this lesson is for students to write equivalent fractions to add tenths and hundredths, up to a sum of 1.

Lesson Narrative

Prior to this lesson, students refreshed their understanding of equivalence. They used it to reason about sums and differences of fractions whose denominators are different but are factors or multiples of one another (2, 4, and 8, and 2, 3, and 6). This lesson extends that work to include fractions with denominators of 10 and 100. Students revisit how to write equivalent fractions in tenths and hundredths, and then use that understanding to add tenths and hundredths, up to a sum of 1.
  • Representation
  • MLR1

Learning Goals

Teacher Facing

  • Use equivalent fractions to add tenths and hundredths, up to a sum of 1.

Student Facing

  • Let’s add some tenths and hundredths.

Required Preparation

CCSS Standards

Building On


Building Towards

Lesson Timeline

Warm-up 10 min
Activity 1 15 min
Activity 2 20 min
Lesson Synthesis 10 min
Cool-down 5 min

Teacher Reflection Questions

Reflect on a time recently when your thinking about students’ understanding or reasoning changed. What led to the change in perspective? How will you alter your teaching practice to incorporate your new understanding?

Suggested Centers

  • Compare (1–5), Stage 6: Add and Subtract Fractions (Addressing)
  • Rolling for Fractions (3–5), Stage 2: Multiply a Fraction by a Whole Number (Addressing)
  • Compare (1–5), Stage 3: Multiply within 100 (Supporting)

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