5 * 99 = 495
You could break 99 up into smaller pieces, and find the answer by multiplying each of those pieces by 5:
5 * 9 + 5 * 25 + 5 * 25 + 5 * 20 + 5 * 20 = 495
You can do this since ab + ac = a(b + c).
99 x 99 = 9801
99 multiplied by 36 is 3,564.
97 x 99 = 9603
4 multiplied by 99 is 396.
1583.01
693
3267
19701
9207
33 x 3 = 99
99/7=14.14285714
99 multiplied by 100 equals 9900.