There are 6 pairs of numbers that go into 525. Here are all of the whole number (numbers without decimals or fractions) pairs:
525+525
262 with 1 remaining 525 - 1 = 524 = 2 x 262
528, 1056, 1584, 2112, 2640 +525 . . .
525 / 75 = 7
25 x 25 = 525.
525 = 3*5*5*7
15, 21, 25, 35, 75, 105, 175, 525
How about: 500+25 = 525 as one example of many more examples
fifteen 525 / 35 = 15
525 and 25
There are infinitely many possible answers. Among them, 1*525, 10*52.5
525 ÷ 15 = 35