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Arundeep
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MULTIPLICATION BY TWO DIGIT-NUMBERS : Ex. 1 : Solve => (1) 12x13 =? (2) 17x18 =? (3) 87x92 =?Soln : (1) 12 x 13 = ? Step I. Multiply the right-hand digits of multiplicand and multiplier (unit-digit of multiplicand with unit-digit of the multplier).
Step II. Now, do cross-multiplication, ie, multiply 3 by 1 and 1 by-2.
Add the two products and write down to the left of 6.
Step III. In the last step we multiply the left-hand figures of both
multiplicand and multiplier.
So answer is 156. Soln : (2) 17 x 18 = ?
So answer is 306. Soln : (3) 87 x 92 = ?
So answer is 8004. Practice Question Solve the following: (1) 57 x 43 (2) 51 x 42 (3) 38 x 43 (4) 56 x 92 (5) 81 x 19 (6) 23 x 99 (7) 29 x 69 (8) 62 x 71 (9) 17 x 37 (10) 97 x 89 ANSWERS : (1) 2451 (2) 2142 (3) 1634 (4) 5152 (5) 1539 (6) 2277 (7) 2001 (8) 4402 (9) 629 (10) 8633 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||