Regrouping 100s & 10s to Subtract

You may hear your child and her teacher talk about Place Value Disks. When learning place value, addition, and subtraction, place value disks are a great tool to tie together your child’s understanding before using the standard algorithm. They are especially helpful when regrouping, that is, changing one unit to another unit. Watch this tool in action on a place value chart. Forty-three minus sixteen.

Tape Diagrams: Modeling 2-Digit Addition and Subtraction

Your child continues to use tape diagrams as a visual tool to solve word problems. Now, he solves for an unknown in any position. Here’s a second grade word problem: There are twenty-three students in Miss Nord’s class. Seventeen students are present today. How many students are absent? Let’s draw a tape diagram to see what this problem asks us to find.