By Takashi Kojima


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Fig. 147). METHOD B: Adding from lower to higher denominations: STEP 1: Set 8 on unit rod G. Add 7 and 11 to the 8 on G, and you get a total of 26 on FG (Fig. 148). STEP 2: Divide the 26 on FG by 12, and set the quotient 2 on D, which is the proper rod on which to set the quotient. This gives you 2 on D and leaves 2 on G (Fig. 149). STEP 3: Add 1, 2, and 2 successively to the 2 on D. This makes a total of 7 on D (Fig. 150). STEP 4: Divide the 7 on D by 3, and set the quotient 2 on B, which is the proper rod on which to set the quotient.

6d. On the abacus the computation is made mostly in the same way as in the following written calculation. STEP 1: Set 4 on unit rod E, and 2 and 6 on H and K respectively. Set the multiplier 18 on AB (Fig. 162). NOTE: Experts, however, often do not actually set the multiplier. 50 Advanced Abacus Japanese Theory and Practice, by Takashi Kojima STEP 2: First multiply the 6 on K by 18, and you get the product 108 on LMN. Now clear K of its 6 (Fig. 163). STEP 3: Now divide the 108 on LMN by 12 and you get the quotient 9 on K, having cleared LMN of the 108.

Finally add 11 to the 15 on FG. This makes a total of 26 on FG (Fig. 145). STEP 4: Now divide the 26 on FG by 12, and add the quotient 2 to the 5 on D, leaving the remainder 2 on G. This makes a total of 7 on D (Fig. 146). NOTE: In dividing the 26 on FG, experienced operators generally do not set the divisor 12 on the board. STEP 5: Finally divide the 7 on D by 3, and add the quotient 2 to the 65 on AB, leaving the remainder 1 on D. This makes a total of 67 on AB. The answer is 67 yd. 1 ft. 2 in.

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