Maths Quiz

A maths quiz (don't use a calculator!)

1 calculate 15 x 25 +1325 =?
2 calculate 4521 x 156 +999-852 =?
3 calculate 45126 x 45 + 562 - 444 = ?
4 calculate 32615 x 78 + 524 - 456 = ?
5 calculate 56425 x33 + 652 -424 =?