225.
My 9th grade teacher made me memorize the squares of all numbers from 1 to 25 and I have never regretted the hour or so I spent on this task. You might be amazed at how useful this was-- I strongly recommend that you do the same.
600 multiplied by 15 is 9,000.
80 multiplied by 15 is 1200.
6 multiplied by 15 is 90.
15 multiplied by 15 is 225.
15 multiplied by 15 is 225.
16515 multiplied by 11 is 165.
11 multiplied by 15 is 165.
15 * 500= 7500
22 multiplied by 15 is 330.
88 multiplied by 15 is 1,320.
15 multiplied by 6 is 90.
3.14 multiplied by 15 is 47.1