Here is the step by step abacus math solution for NO-COMPLEMENTS-EXAMPLE-19 problem from rightlobemath.com. Rods are referenced left to right consecutively by letter labels ABCDE. Rod E is any selected unit rod (usually with a dot), i.e. the one's place, chosen on the abacus.
1 |
8 |
-9 |
4 |
4 |
Step 1: Add 1 to 0 on rod E.
Step 2: Add 8 to 1 on rod E.
Step 3: Subtract 9 from 9 on rod E.
Step 4: Add 4 to 0 on rod E.
The final answer is 4
The examples focus on teaching the 6 fundamental abacus bead movements needed for all arithmetic problems including multiplication and division. The example presented here is NO-COMPLEMENTS-EXAMPLE-19. As students work with the abacus or soroban, they begin to visualize the same bead movements in their head developing strong mental images used in mental math. If you want your child to accel in arithmetic, the RightLobeMath online abacus math program will help get results. Whether you are looking for an online elementary math program, a home school arithmetic math program, or a comprehensive mental math program give rightlobemath.com at try today!