In this kind of multiplication following things are to be checked.
1. Last digit of both numbers must add to 10.(eg 5+5, 4+6 etc. )
2. Both numbers must have previous digit same (eg. 56 and 54 )
56 * 54 = 3024
1) 5 * 5+1 (take the previous number and multiply it with number formed by adding 1 to previous number , here previous number is 5)
2) 6 * 4 (now last digits which are complimentary to each other are multiplied )
5*5+1/6*4 (this form the whole answer)
5*6/6*4
Answer : 3024
112 * 118 =13216
Trick:
1) 11(common previous number )
2) 11+ 1 =12 (add 1 to previous number )
3) 11 * 12 = 132 ----> first part of answer
4) 2* 8 ( last digit of both number ) =16 ---->last part of answer.
5) combine both first part and last part of answer.
Answer : 13216
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