To be fair, even the second set of answers allow you to easily work out which answer is right without doing anything too tedious.
1280x97...
8x7? 56
Stick on the zero, 560.
Voila, answer must end in a 60, question answered.
Try not to get too intimidated by the big numbers, there is always a simpler way. Focus on your methods rather than practicing actual numbers and you can't go far wrong, whatever format the questions take.