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1. 1)
15 + =
15 – 1 + 3 =
17

2. 2)
25 =
20

3. 3)
15

4. 4)
+7 – 1 + 11
17

5. 5-
30

6. 6-

7. 7-

8. 8-

9. 9-
=
=
=
=
=
=
=

10. 10-
17- =
17- =
17- =
17- =
17- =
17- =
17- =
17- =

11. 11-
3 +15 = 18