It just faster to do criss cross multiplication in this question and you can get the answer in less than 30 secs.

9 9 9 8

9 9 9 8

Units place : 8 x 8 = 64 => Units place is 4 with carry over of 4

Tens place : 9x8 + 9x8 + 6 = 150 => Tens place is 0 with carry over of 15

You can stop here since you have already found answer by checking options

This is criss cross multiplication technique from vedic mathematics (

http://www.brighthubeducation.com/homew ... thematics/) and i would highly recommend looking it up.

Elaborating 100's place : 9x8 + 9x9 + 9x8 +15 = 240 => 100s place is 0 with carry over 24

1000 place : 9x8 +9x9 + 9x9 + 9x8 + 24 = 330 => 1000 place is 0 with carry over 33 and so on....

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