The Holy Cross Second Graders are learning the importance of understanding place value of a 2-digit number to help with regrouping in addition. The students have used base-10 blocks, base-10 drawings, and number lines to demon-strate how to regroup 10-ones into 1 ten. The pupils also used expanded form in a partial sum algorithm to solve 2-digit plus 2-digit addition problems with and without regrouping. The second graders also reviewed number bonds that make 10 and number bonds that show ten plus more ones. The children continued to use number bonds that show ten plus more ones to help with associative property of addition to help with adding more than three 2-digit Numerals. The students used each tool to help them work more efficiently with the addition of 2-digit numbers with and without regrouping. The result of their work shows great growth and understanding.