Do from left to right
Add 2 in 100's column
Add 3 in 10's column
Complement of 4 is 1, take away 1 in 1's column, add 5
Answer is 335
921 + 34 (921 plus 34)
421 + 104 (421 plus 104)
651 + 224 (651 plus 224)
Now do the worksheet
Video: Abacus Lesson 11: Addition, Complements of 5, 100's column
Acknowledgement: Credit John of HEV Project. This post is a summary of HEV Abacus Lessons
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