UNIT PREPARATION

Display the Math Practices page where all students can see it.

Students will need the following tools readily available for the
Daily Practice and Problems items in this unit:

LESSON SESSIONS DESCRIPTION SUPPLIES

LESSON 1

From the Fish Hatchery

 2 Students extend their understanding of multiplication concepts to multiplication of 2-digit by 2-digit numbers. They use mental math, rectangles, and expanded form to find solutions.

LESSON 2

All-Partials Revisited

 2 Students explore another paper-and-pencil method for multiplication of 2-digit by 2-digit numbers—the all-partials method. They compare this method to using the rectangle model and expanded form. All three methods rely on breaking the numbers into tens and ones and using the distributive property to find partial products.

LESSON 3

Workshop:
Multiplication Methods

1–2 Students practice solving multiplication problems involving 2-digit numbers. This Workshop allows students to choose from several problem sets and play a game to review multiplication concepts and practice multiplication methods.
  • My Multiplication Menu created in Lesson 2
  • envelope to store Digit Cards 0–9

LESSON 4

Compact Multiplication Revisited

 2–3 Students review the compact method of multiplication and then use it to multiply two-digit by two-digit numbers. They compare all paper-and-pencil methods and practice multiplication.
  • My Multiplication Menu created in Lesson 2

LESSON 5

Choosing Strategies to Multiply

 2 Students apply strategies involving estimation, mental math, and paper-and-pencil methods to solve problems involving two-digit multiplication. This lesson focuses on choosing and applying strategies flexibly to match the context of problems. Students also use these strategies flexibly to solve an extended, open-response problem involving two-digit multiplication.
  • My Multiplication Menu created in Lesson 2
  • rulers

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Suggested Titles for Students

  • Haskins, Jim. Count Your Way Through the Arab World, illustrated by Dana Gustafson. Carolrhoda Books, Minneapolis, 1987.
  • Ifrah, Georges. The Universal History of Numbers: From Prehistory to the Invention of the Computer. John Wiley & Sons, New York, 2000.
  • St. John, Glory. How to Count Like a Martian. Henry Z. Walch, New York, 1975.
  • Schmandt-Besserat, Denise. The History of Counting, illustrated by Michael Hays. Morrow Junior Books, New York, 1999.
  • Sitomer, M., and H. Sitomer. How Did Numbers Begin?, illustrated by Richard Cuffari. Thomas J. Crowell, New York, 1976.

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Resources for Teachers

  • Eves, Howard. An Introduction to the History of Mathematics. The Saunders Series, Harcourt Brace Jovanovich College Publishers, New York, 1990.
  • Gillings, Richard J. Mathematics in the Time of the Pharaohs. Dover Publications, New York, 1972.
  • Ifrah, Georges. The Universal History of Numbers: From Prehistory to the Invention of the Computer. John Wiley & Sons, New York, 2000.
  • Menninger, Karl. Number Words and Number Symbols, A Cultural History of Numbers. Dover Publications, New York, 1992.
  • Robins, Gay, and Charles Shute. The Rhind Mathematical Papyrus, An Ancient Egyptian Text. Dover Publications, New York, 1987.