Multi-Digit Addition Worksheets - Super Teacher Worksheets The worksheets on this page can be used to teach students to solve doubles +1 facts. These are addition problems where students double a number, then add one. (examples: 2+3=5, 5+6=11, 8+9=17) Fact Families (Addition/Subtraction) This section has several worksheets for teaching fact families. (Also known as number bonds or number families.)