Common Core State Standard
Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.
CCSS: 1.OA.B.4, 1.OA.C.6
The Subtraction Dogs are strutting their stuff with their disappearing act. Help them with their act by using your subtraction skills to get them to the right platform.