India 1919 multiplication is really simple and fascinating
Please try to calculate the following answer mentally:
13X12 =?
(Multiplier) (multiplier)
The Indians calculated it this way.
The first step is to add (13) to the single digit of the multiplier (2)
１３＋２＝１５
Step 2: Then multiply the answer from step 1 by 10 (→ that is, add a 0 after it)
Step 3: Multiply the single digit of the multiplier (3) by the single digit of the multiplier (2).
2X3 = 6
(13 + 2) X10 + 6 = 156
So that was it. It was just amazing.
Let's try to calculate:
１４×１３：
(1) １４+３＝１７
(2)１７×１０＝１７０
(3)４×３＝１２
(4)１７０+１２＝１８２
-----------------------------------------------------------
１６×１７：
(1)１６+７＝２３
(2)２３×１０＝２３０
(3)６×７＝４２
(4)２３０+４２＝２７２
-----------------------------------------------------------
１９×１９
(1)１９+９＝２８
(2)２８×１０＝２８０
(3)９×９＝８１
(4)２８０+８１＝３６１
-----------------------------------------------------------
It's really simple, let's hurry up and let the children learn it, right?
