Abacus Videos (English)

Addition & Subtraction Formulas and Examples
{ More & more Abacus Video links will be added to this Page as they are created. }

* Introduction: Benefits of Abacus Course for different Age brackets.   Video

* Things to know before you begin your Abacus Course:    Video

* Lesson 1: Identification of Numbers on Abacus:   Video 

* Lesson 2: Small Friend Addition concept on Abacus:   Video 

* Lesson 2A: Small Friend Addition sums from Workbook (+1 & +2 Formulas):   Video  

* Lesson 2B: Small Friend Addition sums from Workbook (+3 & +4 formulas):   Video 

* Lesson 3: Small Friend Subtraction concept on Abacus:   Video 

* Lesson 3A: Small Friend Subtraction sums from Workbook (-1 & -2 Formulas):   Video 

* Lesson 3B: Small Friend Subtraction sums from Workbook (-3 & -4 Formulas):   Video 

* Lesson 2 & 3 example explained: 79 - 65 + 73 - 83 :   Video 

* Lesson 4: Big Friend Addition concept on Abacus:   Video 

* Lesson 4A: How to do: 49 + 1 + 9 + 6 and 43 + 3 + 2 + 8 :   Video 

* Lesson 5: Big Friend Subtraction concept on Abacus:   Video 

* Lesson 4 & 5 Special Situation: Ex. (36 + 65 -- 52):     Video

 * Lesson 5A: Ex: (1000 - 23) (10000 - 367):   Video

 * Lesson 6: Combination Formulas for Addition of digits 6 to 9 on Abacus:   Video

* Ex. on use of Small Friend, Big Friend & Combination Formulas: (32 - 12 + 44 + 88):    Video

* Lesson 6 Ex: (69 + 83 - 42) (95 + 77 - 63):   Video  

 * Lesson 6 Ex: (123 + 345 + 567 + 789):   Video 

 * Lesson 6 Ex: (99 + 88 + 77 + 66 + 55 + 44 + 33 + 22 + 11):   Video

 * Lesson 6 Ex: (234 + 5678 + 901 + 3642) (98765 + 4321 + 2345):   Video

 * Lesson 7: Combination Formulas for Subtraction of digits 6 to 9 on Abacus:   Video 

* Lesson 6 & 7 Ex: (18 + 18 + 18 - 39):   Video

* Abacus + & - Mix Sum: Ex: (10 + 35 + 84 - 63 + 59 - 27 + 82 - 79):     Video

 * Lesson 7 Ex: Subtraction Range: (1500 - 56 - 57 - 58 - 59 - .... - 64 - 65):   Video 

* Lesson 7 Ex: Subtraction Range: (900 - 66 - 67 - 68 - 69 - 70):   Video 

* Lesson 7 Ex: Subtraction Range: (400 - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10):   Video 

* Lesson 7 Ex: (67 - 43) (815 - 72 - 48) (624 - 96 - 24):   Video

* Lesson 7 Ex: (1000 - 76 - 77 - 78 - 79 - 80 - 81):   Video

* Lesson 7 Ex: (1221 - 228) (39 + 64 - 7):   Video
* Addition of 2 Big Numbers: Ex: (17654408 + 64347953467): Video


Range Sums for Excellent Practice of Formulas
* Lesson 6 Ex: (55 + 56 + 57 + 58 + 59 + 60):   Video          (2-digit Addition Range)

* Lesson 6 Ex: (74 + 75 + 76 + 77 + 78 + 79 + 80):   Video          (2-digit Addition Range)

 * Lesson 6 Ex: (1 + 2 + 3 + 4 + 5 + 6 + ...... + 24 + 25):   Video

 * Lesson 6 Ex: (59 + 60 + 61 + .... + 68 + 69):   Video 

 * Lesson 6 Ex: (33 + 34 + 35 + 36 + ..... + 42 + 43):   Video

* Lesson 7 Ex: (900 - 37 - 38 - 39 - ..... - 46 - 47):   Video 

* Lesson 7 Ex: (900 - 61 - 62 - 63 - ..... - 68 - 69 - 70):   Video 

* Lesson 7 Ex: (1111 - 86 - 87 - 88 - ..... - 93 - 94 - 95):   Video

 * Lesson 6 & 7 Ex: (32 + 33 + ....... + 41 + 42 - 32 - 33 - .... - 41 - 42):   Video
* Lesson 6 & 7 Ex: (58 + 59 - 60 + 61 + 62 - 63 + 64 + 65 - 66 + 67 + 68 - 69):   Video

* Lesson 6 & 7 Ex: (54 + 60 - 27 + 32 + 19 + 74 - 65 + 21 + 90 - 78):   Video 

 * Lesson 6 Ex (3-digits): (246 + 247 + 248 + 249 + 250 + 251 + 252):   Video 

 * Lesson 6 Ex (3-digits): (373 + 374 + 375 + ..... + 379 + 380):   Video

 * Lesson 7 Ex (3-digits): (4321 - 183 - 184 - 185 - .... - 189 - 190):   Video 

 * Lesson 7 Ex (3-digits): (3210 - 266 - 267 - 268 - ..... - 273 - 274):   Video 

 * Lesson 6 & 7 Ex (Decimal Numbers): Ex: (1.27 + 3.48 + 0.33 + 4.65) (3.72 + 0.99 - 1.28 - 0.73):   Video

 * Lesson 6 & 7 Ex (Jumbo Sum): 16 Numbers: Add, Subtract & Borrowing: 2-digit, 3-digit & 4-digit:   Video 





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