Number and algebra

1. 30 + 10 =40

30 + 10 = 40 so I did 3 + 1 = 4 and 0 + 0 =0 witch give me 40

2. 26 + 20 = 46

26 + 20 = 46 so I did 2 + 2 = 4 and 6 + 0 = 6 witch give me 46

3. 54 + 30 = 84

54 + 30 = 84 so I did 5 + 3 = 8 and 4 + 0 = 4 witch give me 84

4. 39 - 10 = 29

39 - 10 = 29 so I did 3 - 1 = 2 and 9 - 0 = 9 witch give me 29

5. 99 - 10 = 89

99 - 10 = 89 so I did 9-1=8 and 9-0=9 witch give me 89



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