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คณิตศาสตร์ 
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Transcript

5 min.

คณิตศาสตร์

Start

1. 2+1 = ?

2. 4+3=?

3. 8+9=?

18

17

4. 10+5=?

16

15

30

25

5. 15+15=?

21

14

12

11

6. 15-3=?

10

15

7. 25-10=?

20

30

8. ?-10=10

35

25

9. ?-15=10

12

10. ?+9=18

23

24

11. ?+12=35

40

30

12. ?+10=50

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