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Copyright ©, Long Beach Unified School District. All rights reserved. - Grade 1 Addition with Regrouping 2 digits + 1 digit Write the 2 digits + 1 digit problem horizontally. Students rewrite the problem in working form while reading the problem aloud splitting the tens and ones in the two digit number. Ex. 35+8= Three tens, five ones 3 5 Down and to the left plus eight ones + 8 Equals IAATF Trimester 2 Addition with Regrouping2 digits + 1 digit Page 1

Copyright ©, Long Beach Unified School District. All rights reserved. - Grade 1 Begin adding in the ones column. 3 1 + 8 Ask these questions: Is the sum greater than 9? Is the sum a two digit number? Can the sum be split into tens and ones? 3 1 + 8 3 9 9 If NO, then write the sum and bring down the tens. IAATF Trimester 2 Addition with Regrouping2 digits + 1 digit Page 2

Copyright ©, Long Beach Unified School District. All rights reserved. - Grade 1 If the answer was YES, then REGROUP. 3 5 + 8 Orally split the sum into tens and ones while writing so the 1 ten is written FIRST and then the 3 ones. 1 Ex. 3 5 + 8 3 13 One tens three ones IAATF Trimester 2 Addition with Regrouping2 digits + 1 digit Page 3 Is the sum greater than 9? Is the sum a two digit number? Can the sum be split into tens and ones?

Copyright ©, Long Beach Unified School District. All rights reserved. - Grade 1 Add the tens column. 1 3 5 + 8 4 3 Rewrite the sum with the digits together. 1 3 5 + 8 4 3 IAATF Trimester 2 Addition with Regrouping2 digits + 1 digit Page 4

Copyright ©, Long Beach Unified School District. All rights reserved. - Grade 1 Addition with Regrouping 2 digits + 2 digits Rewrite the problem vertically while reading it aloud, splitting the tens and ones in both numbers. Ex. 35+48= Three tens, five ones 3 5 Down and to the left plus four tens eight ones + 4 8 Equals IAATF Trimester 2 Addition with Regrouping2 digits + 2 digit Page 1

Copyright ©, Long Beach Unified School District. All rights reserved. - Grade 1 Add the ones column Ask these questions: Is the sum greater than 9? Is the sum a two digit number? Can you split the sum into tens and ones? 3 1 + 4 8 9 If NO, then write the sum and add the tens column. IAATF Trimester 2 Addition with Regrouping2 digits + 2 digit Page 2