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Happiness multiplied
Conniving twenty-fiving
Mixed number percent - common fraction "Blah-Blah"
Fractionating Decimals -Decimating Fractions
Roman - Arabic
Don't Underestimate Me
Fraction Subtraction
KHDBdcm
100

11 x 45

495

100

25 x 16

400

100

5 1/2%

11/200

100

2/5

0.4

100

CDXLVIII

448

100

(*) 2020 x 11 - 2020

19190-21210

100

3/4 - 1/2 

1/4

100

500 deciliters to Liters

50 Liters

200

121 x 50

6050

200

32 x 25

800

200

2 1/5%

11/500

200

.6

3/5

200

772

DCCLXXII

200

(*) 2020 x 25

47975-53025

200

5/6 - 1/3

1/2

200

40 Hectograms to decigrams

40,000 decigrams

300

14 x 16

224

300

18 xx 25

450

300

16 2/3%

1/6

300

1/8 

.125

300

MCLXIV

1164

300

(*) 192034 -: 248 

736-813

300

7/8 - 1/4

5/8

300

400,000,000 millimeters to kilometers

400 kilometers

400

75 x 24

1800

400

1025 -: 25

41

400

3 3/4%

3/80

400

.375

3/8

400

1456

MCDLVI

400

(*) 555 x 1790 + 202

943970 - 1043334

400

4/5 - 1/2 

3/10

400

423 centiliters to Dekaliters

.423

500

125 x 40

5000

500

975 -: 25

39

500

12 1/2%

1/8

500

5/8

.625

500

1789

MDCCLXXXIX

500

 (*) 6 1/4  x 31980

189882 - 209868

500

5/8 - 1/3

7/24

500

45 kilograms to decigrams

450,000 decigrams