addition/加
subtraction/减
random/随机
challenge/挑战
challenge/挑战
100

15+16 = ?

31

100

11-9= ?

2

100

18+4 = ?

22

100
1 + 3 - 2 = ?

2

100

5 - 5 + 12 = ?

12

200

10 + 11 = ?

21

200

15 - 4 = ?

11

200
16 - 2 = ?

14

200

4 + 5 - 3 = ?

6

200

13 - 9 + 4 = ?

8

300

15 + 20 = ?

35

300

20 - 16 = ?

4

300

123 - 11 = ?

112

300

12 - 5 + 3 = ?

10

300

30 - 16 - 4 = ?

10

400

4 + 5 + 6 = ?

15

400

20 - 10 - 5 = ?

5

400

12 + 15

27

400

27 - 12 + 1 = ?

16

400

12 + 17 + 5 = ?

34

500

11 + 5 + 15 = ?

31

500

50 - 41 = ?

9

500

110 - 15 = ?

95

500

13 + 17 - 15 = ?

15

500

151-38 = ?

113

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