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1. 30 + 17 - 6
= 47 - 6
= 41

2. 30 - 17 + 6
= 13 + 6
= 19

3. 100 : 20 x 5
= 5 x 5
= 25

4. 100 x 20 : 5
= 2.000 : 5
= 400

5. 20 : 2 x 5
= 10 x 5
= 50

6. 5 + ( 21 : 7 )
= 5 + 3
= 8

7. 7 + ( 5 x 3 )
= 7 + 15
= 22

8. ( 24 : 8 ) + 3
= 3 + 3
= 6

9. 8 + ( 12 : 4 )
= 8 + 3
= 11

10. 12 + ( 6 : 2 )
= 12 + 3
= 15

1) (17-6)+30=41
2)(30-17)+6= 19
3)55
4)400
5)50
6)8
7)22
8)6
9)11
10)15