Unit Description
The subject of the second unit is
computation and estimation strategies.
It addresses the exploration of a wide range of strategies for
computation and estimation, especially with multiplication and division. These strategies include reasoning about
multiples; skip counting, approximating the numbers in a problem to nearby
familiar numbers and then adjusting, and breaking problems into smaller more
manageable parts.
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Enduring Understandings
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There are different ways to work and solve a problem.
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Thinking about what I know is important in solving
problems.
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Answers to problems must make sense.
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Essential Questions
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How do I decide which strategy to use in problem solving?
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How does my past learning experiences help me problem
solve?
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How is estimation best used to
predict answers?
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How do I know whether an answer is reasonable?
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When is the exact answer not the best solution?
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Students will know…
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Prime Numbers
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Composite Numbers
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Skip counting
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Strategies for subtracting
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How to relate addition to multiplication
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Sequence 4- and 5-digit numbers
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Factors and multiples
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Mental math and estimation
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Use of remainders
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Multiple ways to solve problems
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Know relationships between multiplication and division
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Know relationships between addition and subtraction
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Know relationships between addition and multiplication
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Know relationships between subtraction and division
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Know how to model large numbers with arrays
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Students will be able
to…
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Describe numbers and number relationships with the terms factor,
multiple, prime, and square.
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Reason about number characteristics such as multiple,
factor, even, odd, prime, and square.
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Represent factor pairs as dimensions of a rectangular
array.
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Skip count by 2-, 3-, and 4-digit numbers between any two
4- or 5-digit numbers.
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Use skip counting patterns to help solve multiplication and
division problems.
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Develop, record, and compare strategies for solving
multiplication and division problems.
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Make sense of remainders.
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Understand relationships between multiplication and
division.
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Understand how multiplication and division can represent a
variety of situations.
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Model situations with multiplication, division, and other
operations.
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Estimate solutions to division and multiplication
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