Doubles Addition

Easy

100

1+1

2

200

2+2

4

300

3+3

6

400

4+4

8

500

5+5

10

Simple

100

6+6

12

200

7+7

14

300

8+8

16

400

9+9

18

500

10+10

20

Medium

100

11+11

22

200

12+12

24

300

13+13

26

400

14+14

28

500

15+15

30

Hard

100

16+16

32

200

17+17

34

300

18+18

36

400

19+19

38

500

20+20

40

Hardest

100

21+21

42

200

22+22

44

300

23+23

46

400

24+24

48

500

25+25

50