11² - 19²
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With this trick, you can find square of 11² -19² just with mind calculation.
Let's try this,
Take an example ,
FOR 12 ²,
ANSWER COMES IN TWO PART ,
STEP 1 :
IN OUR QUESTION 12 ² , ADD 12 +2 (unit digit in 12².) "14" BEING THE FIRST PART ANSWER.
STEP 2 :
(ONLY ONE CONDITION FOR THIS TRICK IS,
SECOND PART ANSWER SHOULD BE ONE DIGIT)
FIND " 2² " (Here 2 is unit digit of 12²) "4" BEING THE SECOND PART ANSWER.
🤗 ON THE WHOLE ,WE ADD AND SQUARE THE NUMBER "2"(unit digit of 12²).
FINALLY , ANSWER FOR 12² is "144"
ANOTHER EXAMPLE :
TAKE 18 ²,
STEP 1:
ADD 18 +8 ="26"
STEP 2:
8 ² = 64,
( BUT OUR CONDITION IS SECOND PART MUST BE ONE DIGIT, HERE, WE GET NUMBER "64" WHICH IS TWO DIGIT , ADD 6 TO FIRST PART ANSWER. AND 4 REMAINS SECOND PART FOR OUR ANSWER.)
FINALLY , ANSWER FOR 18² is 324.
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