Addition One Digits was the first addition to the ROTC in the U.S. as a resource for teenagers attending the ROTC training academy, The Leadership Training Corp. It was written by Jerry Savini and published by O’Reilly and Associates in 1997.
The book is credited with introducing the use of addition to military personnel, military families, and ROTC in the United States. Originally one million copies were printed and today is still being sold.
In recent years, many ROTC schools have incorporated addition, as a classroom tool. ROTC service academies have been using addtition for decades, to help students become aware of addition and addendums.
The curriculum has been adapted to make the curriculum relevant to elementary school age students, and this has served to expand its usefulness. Adding numbers by hand is an effective method of teaching students the basics of addition and subtraction, including adding the same number that is multiplied.
This site contains graphing calculators, a Gretchensheet. With a Gretchensheet, the students can draw the graph of their multiplication. Students can choose to draw a line connecting the multiply and the addend, or they can draw the addend themselves.
This provides a basis for understanding addition. Once the students understand addition, they will be ready to apply it to other graphing problems. It is important to note that addtition is not math and can be an educational opportunity for students with cognitive disabilities.
Free Number Bonds Practice Worksheet 
Free Penny Addition 1 Digit Let’s Make 10 Worksheet