What makes a computational strategy both efficient and effective?
How do mathematical ideas interconnect and build on one another to produce an answer?
How can the four operations in decimals related to one another?
How does one recognize the strategy to be used for a specific operation?
How can models help us understand decimals?
How can we determine the reasonableness of an answer when solving a problem?
How are decimals different from whole numbers?
LP 5.NBT.B.5-7 Multiplying Decimals to Hundredths
Lesson Seed B.5: Standard Algorithm for Multiplication Based on Place Value
Lesson Seed B.7: Addition & Subtraction with Decimals
Content Emphasis By Clusters in Grade 5
Progressions from Common Core State Standards in Mathematics
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Lesson seeds are ideas that can be used to build a lesson aligned to the CCSS. Lesson seeds are not meant to be all-inclusive, nor are they substitutes for instruction. When developing lessons from these seeds, teachers must consider the needs of all learners. It is also important to build checkpoints into the lessons where appropriate formative assessment will inform a teachers instructional pacing and delivery.
Standard(s): 5.NTB.b.5 Fluently multiply multi-digit whole numbers using the standard algorithm.
To understand why the standard algorithm works based using place value for multiplication.
Standard Algorithm Explained Using Place Value
45 (3 x 5) + (3 X 10) = 15 + 30 = 45
300 (20 x 5) + (20 x 10) = 100 + 200 = 300
Games to build fluency:
2. Four Tiles
Students play an interactive game where correct answers allow them to place a tile on the board. The first person to get four tiles in a row wins.
3. Product War
Player 2 wins all 8 cards.