Consolidate 2-digit addition with base-ten blocks. Worksheets are included for three different levels:Level 1: Add a single-digit number to a 2-digit numberLevel 2: Add 2-digit numbersLevel 3: Add a 2-digit number to a 3-digit numberThis activity is included in The Hive's Math program for FORMING MULTIPLES OF 10 FOR ADDITION (Grades 1 & 2).