• Define subtraction as taking away from a given set, comparing two sets, or finding the missing addend
  
• Visualize, represent, and subtract two- to three-digit numbers with minuends up to 999 without regrouping
  
• Visualize, represent, and subtract one- to two-digit number with minuends up to 999 with regrouping;
  
• Visualize, represent, and subtract two-to three-digit number with minuends up to 999 with regrouping
  
• Visualize, represent, and subtract two- to three-digit numbers with minuends up to 999 with regrouping
  
• Perform orders of operations involving addition and subtraction of small numbers