Subtraction
Mental Math
Scientific Notation
Roman Numerals
Addition
100

15-10

5

100

Solve this using mental math

30 - 15.50

14.50

100

0.005

5x10-3

100

CCXCI

291

100

10 + 15

25

200

23-30

-7

200

Solve this using mental math

3.50 + 4.50

8.00

200

76300

7.63x104

200

DCXLI

641

200

15+25

40

300

200-56

144

300

Solve this using mental math

75 - 50.50

24.50

300

2,560,000

2.56x106

300

MDCXCIX

1699

300
100+25

125

400

356-189

167

400

Solve this using mental math

8.75 + 3.25

12.00

400

0.000066

6.6x10-5

400

MDCCCXXIX

1329

400

200+170

375

500

1,760-390

1,370

500

Solve this using mental math

250.0 + 130.0 

380.0

500

125,000

1.25x105

500

MCMXCII

1992

500

2,345+1,455

3,800