1. Short Trick to multiply 2 digit numbers:-
In this trick, we learn about ‘How to multiply two-digit numbers quickly’
(i) AB × CD = AC / AD + BC / BD
Let’s Take an example–>
Ex. 35 × 47
= 12 / 21 + 20 / 35
= 12 / 41 / 35
= 1645
[For solving this slash what you have to do is, simply write 5 then add that 3 in the next part then write 4 (1+3) and then add 4 in the next part that will be 16 then]
(ii) AB × AC = A2
/ A (B + C) / BC
If question have first digit same in both numbers that we have to multiply. then solve by this formula!
Ex. 74 × 76
= 72
/ 7(4 + 6) / 4 × 6
= 49
/ 70
/ 24
= 5624
(iii) AB × CC = AC / (A + B)C / BC
Ex. = 35 × 44
= 3×4 / (3+5) × 4 / 5×4
= 12 / 32 / 20
= 1540
2. Short Trick to multiply 3 digit numbers:-
Let, the question given like that ABC × DEF (Here, A, B, C, D, E, F are integers ) then for solving these type of multiplication fast use this formula-
ABC × DEF = AD / AE + BD / AF + BE + CD / BF + CE / CF
Let’s take an example for this—>
Ex. 456 × 234
= 4×2 /4×3 + 5×2/4×4 + 5×3 + 6×2/5×4 + 6×3/6×4
= 8/12 + 10/16 + 15 + 12/20 + 18/24
= 8/22/43/38/24
= 106704
Hope you understood the trick!
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