Regrouping with Addition and Subtraction

Overview

Your student will be learning:

• when adding sometimes it is necessary to regroup 10 ones for 1 ten.
• when subtracting sometimes it is necessary to regroup 1 ten for 10 ones.
• to add up to four two-digit numbers using mental strategies and algorithms.
• to subtract two-digit numbers using mental strategies and algorithms.
• to draw a model drawing/strip diagram and write a number sentence to solve a math problem.

Resources

• Videos
  • Double digit addition with regrouping using a workmat. This instructional video demonstrates double digit addition using workmat, base ten blocks, whiteboard and dry erase marker.
  • Subtraction with Regrouping. This instructional video explains how to subtract 2-digit numbers with regrouping. Base ten blocks are used to model numerals.
  • Addition word problem. This Khan Academy video demonstrates how to solve an addition word problem with regrouping.
  • Subtraction word problem. This Khan Academy video demonstrates how to solve a subtraction word problem with regrouping.
• Free Apps

• Websites
  • Subtraction by "Regrouping". This Math is Fun website demonstrates how to subtract with regrouping with a variety of ways. It also provides practice problems.
  • 2nd Grade Math by IXL. This IXL website provides practice of various math skills. *limited daily access
• Books
  • Mall Mania by Stuart J. Murphy. This book focuses on adding numbers to 100.
  • The Good Neighbors Store an Award: A Cheesy Mouse Tale of Addition with Regrouping by Mark Ramsay. This story models the addition with regrouping process as demonstrated with base ten blocks.
  • The Good Neighbors' Cheese Feast: A Cheesy Mouse Tale of Subtraction with Regrouping by Mark Ramsay. This story models the subtraction with regrouping process as demonstrated with base ten blocks.