Addition: subtract complement, add 5
Subtraction: add complement, take away 5
5 - 3 (5 minus 3)
Complement of 3 is 2, add 2, take away 5)
5 - 4 (5 take away 4
5 - 2 (5 subtract 2)
6 - 2 (6 minus 2)
8 - 4 (8 take away 4)
7 - 3 (7 minus 3)
Now do the worksheet
Video: Abacus Lesson 18: Subtraction, Complements of 5, 1's column
Acknowledgement: Credit John of HEV Project. This post is a summary of HEV Abacus Lessons
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