Order Of Operation

First step

100

3+4 x 5 (3x9)+8 

3 x 9

200

5x3+(9x[6x4]+1)

6x4

300

3+4+1x6(3x9)

3x9

400

3x4x7+1(3x4[7-2])

7-2

500

321x4-187(3x4-2[5x7{5-7}+0]+9)

5-7

Second Step

100

3x4+8x(9+1)

3x4

200

3+5(5x5)x2

5x25

300

4x5(5x7)+7

4x5

400

4x57/1^4

^4

power of 4

500

3x4(5x5[5^9])

5x5

Solve + and -

100

4+2-8=

-2

200

4+3-2+9=

14

300

4-1-9+7+8

9

400

5+7-2+9(2+5)

73

500

3+6-9(6-2+9)

-108

Solve x and /

100

5x5x4/2

50

200

9 x 6/2 x 3

81

300

4 x 9 x 2/8

9

400

3x4x92x2/1

2208

500

(69+69x69-69)/69

69