Investigations 3 in Number, Data, and Space, Student Activity Book [Grade 4]

Unit 5 Large Numbers and Landmarks > Investigation 1 > About the Mathematics in This Unit

NAME ______________________________ DATE _______________

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About the Mathematics in This Unit

Dear Family,

Our class is starting a new addition and subtraction unit, Large Numbers and Landmarks. During this unit, students study place value in large numbers, and complete a final study of addition and subtraction strategies. Students are expected to leave Grade 4 using a variety of strategies, including the U.S. standard algorithms, to fluently solve multidigit addition and subtraction problems.

Throughout the unit, students work toward these goals:

Benchmark/Goal	Examples
Read, write, and compare numbers up to 1,000,000 and round them to any place.	68,094 Expanded form: 60,000 + 8,000 + 90 + 4 Words: sixty-eight thousand, ninety-four Rounded to nearest 10,000: 70,000 Rounded to nearest 1,000: 68,000 Rounded to nearest 100: 68,100 Rounded to nearest 10: 68,090
Fluently solve multidigit addition and subtraction problems using a variety of strategies including the U.S. standard algorithms.	451 − 287 = Solution 1 Solution 2 4 3 5 14 1 11 − 2 8 7 _ 1 6 4 table with 3 rows and 1 column , row1 column 1 , modified cross out enclosing , 4 , end crossout with 3 above , , modified cross out enclosing , 5 , end crossout with 14 above , , modified cross out enclosing , 1 , end crossout with 11 above , row2 column 1 , modified negative 2 8 7 with under bar below , row3 column 1 , 1 6 4 , end table

Benchmark/Goal

Examples

Read, write, and compare numbers up to 1,000,000 and round them to any place.

68,094

Expanded form: 60,000 + 8,000 + 90 + 4

Words: sixty-eight thousand, ninety-four

Rounded to nearest 10,000: 70,000

Rounded to nearest 1,000: 68,000

Rounded to nearest 100: 68,100

Rounded to nearest 10: 68,090

Fluently solve multidigit addition and subtraction problems using a variety of strategies including the U.S. standard algorithms.

451 − 287 =

Solution 1

A number line shows the numbers 287, 300, and 451. An arrow jumps from 287 to 300 and is labeled “13.” Another arrow jumps from 300 to 451 and is labeled “151.”

Solution 2

4 3 5 14 1 11 − 2 8 7 _ 1 6 4 table with 3 rows and 1 column , row1 column 1 , modified cross out enclosing , 4 , end crossout with 3 above , , modified cross out enclosing , 5 , end crossout with 14 above , , modified cross out enclosing , 1 , end crossout with 11 above , row2 column 1 , modified negative 2 8 7 with under bar below , row3 column 1 , 1 6 4 , end table

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About the Mathematics in This Unit

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