50%
20%
10%
5%
Challenge
100

50

25

100

10

2

100

68

6.8

100

60

3

100

5 is 5% of what number?

100

200

28

14

200

30

6

200

57

5.7

200

75

3.75

200

2.7 is 5% of what number?

54

300

39

19.5

300

17

3.4

300

35.6

3.56

300

37

1.85

300

9 is 20% of what number?

45

400

37

18.5

400

43

8.6

400

21.75

2.175

400

63

3.15

400

11 is 20% of what number?

55

500

57.1

28.55

500

37.5

7.5

500

11.11

1.111

500

47.5

2.375

500

3.75 is 20% of what number?

18.75