Abacusjp5_1.les 1.52 KB
 Florian Ernst committed Dec 22, 2009 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 ``````0 0 0 0 4 Lesson 1.5: Multiplication This Lesson demonstrates multiplying 23 * 42 Press Space-bar to Begin, press q to Exit 1 0 1 2 4 Lesson 1.5: Multiplication (23*42) First Represent 23 as 20... (pending operation) Press Space-bar to Continue 1 0 0 3 4 Lesson 1.5: Multiplication (23*42) ...and 3. (This is 23) Press Space-bar to Continue 2 0 1 4 4 Lesson 1.5: Multiplication (23*42) We Represent 4 as 40, so... (pending operation) Press Space-bar to Continue 2 0 0 2 4 Lesson 1.5: Multiplication (23*42) ...and 2. (This is 42) Press Space-bar to Continue 0 0 2 1 4 Lesson 5.1: Multiplication (23*42) 3*4=12 Add 10 part of 12 as 100 Press Space-bar to Continue 0 0 1 2 4 Lesson 5.1: Multiplication (23*42) Add 2 part of 12 as 20 (For 12) Press Space-bar to Continue 0 1 0 1 4 Lesson 5.1: Multiplication (23*42) 3*2=6 so add as 5+1. 5.... Press Space-bar to Continue 0 0 0 1 4 Lesson 5.1: Multiplication (23*42) ... 1 part (For 6) Press Space-bar to Continue 0 1 2 1 4 Lesson 5.1: Multiplication (23*42) 2*4=8 Add 800 as 500+300, so add 500 (for 626) Press Space-bar to Continue 0 0 2 3 4 Lesson 5.1: Multiplication (23*42) and add 300 (For 926) Press Space-bar to Continue 0 1 1 1 4 Lesson 5.1: Multiplication (23*42) 2*2=4 So... add 40 (as 50 - 10), so first 50 part Press Space-bar to Continue 0 0 1 -1 4 Lesson 5.1: Multiplication (23*42) Add -10 part for ... Result 966 Press Space-bar to Continue 0 0 0 0 4 Conclusion: (End) Using the auxiliary abaci to keep the multiplicands and using the primary to add up from the results. Press Space-bar``````