Lesson Plan

Decimal Multiplication Estimations

Challenge students to relate the multiplication of decimals to that of whole numbers. Have them justify their estimations in partners. Use this lesson on its own or use it as support to the lesson Multiply Decimals with Models.
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This lesson can be used as a pre-lesson for the Multiply Decimals with Models lesson plan.
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This lesson can be used as a pre-lesson for the Multiply Decimals with Models lesson plan.

Objectives

Academic

Students will be able to estimate decimal products.

Language

Students will be able to estimate decimal multiplication using peer conversations and paragraph frames.

Introduction

(5 minutes)
Blank Models for Fractions & DecimalsEstimating Decimal ProductsFormative Assessment: Peer Persuasion ChecklistRefine Your Justifications!Vocabulary Cards: Decimal Multiplication EstimationsGlossary: Decimal Multiplication EstimationsTeach Background Knowledge TemplateWrite Student-Facing Language Objectives Reference
  • Display two models on the board, one hundredths model with 0.85 shaded in yellow and one tenths model with 0.60 shaded in blue.
  • Ask students which model has more shaded. (Tip: do not share any vocabulary as you will be gathering background knowledge and accessing their prior knowledge to inform you on what vocabulary to focus on in this lesson.)
  • Ask them to use a whiteboard to copy the models and then use a greater than or less than symbol to show the relationship between the two numbers.
  • Have students share their answers with each other and then choose volunteers to share their whiteboard answers and rationale with the class.
  • Jot down some of the phrases the students use while in peers or presenting to serve as a model for future language use.