## Thousands of Miles, Thousands of Seats: Addition, Subtraction, and the Number System |

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3-digit numbers Activity Book page Activity Book pages Adding and Subtracting addition and subtraction Algebra Connections Ask students changed the numbers chart Closest Estimate complete Student Activity Computational Fluency concise notation Digit Cards discussion Division Facts division problems Estimation and Number Give students given number help students hundreds Implementing Investigations Investigations in Grade landmark numbers Math Focus Points Math Workshop Mathematics Meeting the Benchmark mony multiples of 100 number line Number Sense Observing Students ONGOING ASSESSMENT ongoing review ploce Practice and Homework Practicing Place Value problems with large Range of Learners Related Problems rows sequencing numbers Session 1.3 SESSION FOLLOW-UP Daily solutions solve problems solve subtraction problems solve the problem Solving addition Stadium Starter Problems steps stort story context Student Activity Book Student Math Handbook students complete Student students solve subtract back Subtracting Large Numbers subtracting multiples subtraction strategies Teacher Note thousands U.S. algorithm understanding write