In this unit, students will identify that a digit has value due to its position in a number. Students will compose and decompose whole numbers to identify the value of each position. In addition, students will estimate to a given place value by rounding and will compare numbers using place value. Students will identify that the same number can be composed in multiple ways, and that changing the way a number is expressed does not change the numbers’ value. Students apply their understanding of place value and the properties of addition and subtraction to the standard algorithms for both operations as they work toward fluency by the end of the school year. Students will add and subtract within 1,000,000. Strategies such as decomposing numbers and partial sum are acceptable methods, but students are expected to be fluent with the standard algorithms by the end of the year school year, with an understanding of why and how the algorithms work.
Unitataglance
Key concept: Digits in numbers represent ten times what they represent in the place to the right. 
Key concept: The same quantity can be named and represented in multiple ways, and changing representations or names does not change a number's value. 
Key concept: We can use our understanding of place value to round numbers. 
Key concept: A real number is either equal to, less than, or greater than another real number. We can compare numbers using place value, and record comparisons using <, >, and =. 
Key concept: The meaning of addition does not change depending on how we perform it. The meaning of subtraction does not change depending on how we perform it. 


Suggested pacing 
Days 13 
Days 46 
Days 79 
Days 1012  Days 1317 
Suggested class plan 





Additional unit information
Prior Knowledge Needed:
 Use place value understanding to round whole numbers to the nearest 10 or 100; Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction; Use parentheses to signify grouping and ungrouping; (Grade 3, Unit 3; 3.NBT.A.1, 3.NBT.A.2)
 Multiply onedigit whole numbers by multiples of 10 in the range 1090 (e.g., 9 × 80, 5 × 60) using strategies based on place value and properties of operations; (Grade 3, Unit 8; 3. NBT.A.3)
Units on the Horizon:
 Solve measurement problems using the four operations (Grade 4, Unit 9)
 Problem solving with whole numbers (Grade 4, Unit 14)
 Expanding understanding of place value to decimals (Grade 5, Unit 4)
Lessons, practice, & assessment