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Download 101 Quantitavive Mathematics Shortcut tricks

NUMBER SYSTEM

1. Method to multiply 2-digit number.

(i) AB × CD = AC / AD + BC / BD

35 × 47 = 12 / 21 + 20 / 35 = 12 / 41 / 35 = 1645

(ii) AB × AC = A2 / A (B + C) / BC

74 × 76 = 72 / 7(4 + 6) / 4 × 6

= 49 / 70 / 24 = 49 / 70 / 24 = 5624

(iii) AB × CC = AC / (A + B)C / BC

= 35 × 44 = 3 × 4 / (3 + 5) × 4 / 5 × 4

= 12 / 32 / 20 = 12 / 32 / 20 = 1540

2. Method to multiply 3-digit no.

ABC × DEF = AD / AE + BD / AF + BE + CD / BF + CE / CF

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

Download 101 Quantitavive Mathematics Shortcut tricks

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