Consulting Case Interview - Math Tips

Math shortcuts for case interviews

Note: At 50 seconds, adding the two zeroes isn't the worst practice, but when you start to have a lot of zeroes it is easy to miscount.
For example, 100,000 x 300 can be hard to count zeroes. Instead I go...
100K times 3 = 300K
300K scaled up once = 3M
3M scaled up again = 30M

___ Contents ___
0:00 - Intro
0:10 - Multiplication (700 x 400)
0:21 - 370 x 400
1:30 - 148K + 200K + 300K + 40K
2:56 - 42 x 650 (Breaking numbers into small pieces)
4:30 - 42 x 65% - Multiplication for percents
6:36 - 95K x 180
10:00 - 95, 90, 85, 80, 75 all times 140
12:48 - Division
14:45 - Dividing by percentages
17:00 - 23% x 40