1.Control. Use  :-) and :-(
Liine

14 - 4 = 10
18 - 2 = 15
17 - 5 = 12
19 - 5 = 16
12 - 1 = 11
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......................		 Eerik

16 - 4 = 12
20 - 6 = 13
18 - 5 = 12
17 - 2 = 15
13 - 2 = 11
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2. Kalle had 17 stamps He gave  5 stamps to his brother. How many stamps he has now?

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Answer: ......... stamps