Complement of 4 is 1
Take away 1, add 5
Answer is 15
13 + 2 (13 add 2)
14 + 1 (14 plus 1)
12 + 3 (12 plus 15)
14 + 11 (14 plus 11) (start from left to right, add !0's first)
21 + 14 (21 plus 14)
32 + 23 (32 plus 23)
Now do the worksheets
Video: Abacus Lesson 10: Addition, Complements of 5, 10's column
Acknowledgement: Credit John of HEV Project. This post is a summary of HEV Abacus Lessons
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