Add
Exponents
divide number
divide ratios
change decimal to percent
100

19+27

46

100

44

256

100

2/5

0.4

100

3:2

1.5

100

0.11

11%

200

100+50

150

200

92

81

200

3/4

0.75

200

1:5

0.2

200

0.23

23%

300

 300+90

390

300

32

9

300

9/2

4.5

300

3:1

3

300

0.175

17.5%

400

400+6980

7380

400

55

3125

400

4/8

0.5

400

4:5

0.8

400

0.709

70.9%

500

5000+900

5900

500

102

100

500

6/2

3.

500

5:2

2.5

500

0.467

46.7%