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IBPS Question of the day

IBPS Question of the day. Numerical ability

1. Simplify  (i) 5793405 x 9999 

Answer:
Explain
 5793405x9999 = 5793405(10000-1) = 57934050000-5793405 = 57928256595. 
2. Simplify 1605 x 1605

Answer
Explain 
1605 x 1605 = (1605)2 = (1600 + 5)2 = (1600)2 + (5)2 + 2 x 1600 x 5
= 2560000 + 25 + 16000 = 2576025
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