Scaderea numerelor naturale de la o la 30 cu trecere peste ordin clasa I
- Calculeaza dupa model:
- 20 – 3 = 10 + (10 – 3)
= 10 + 7
= 17
20 – 6 =
20 – 8 =
30 – 4 =
30 – 7 =
- 30 – 12 = 30 – 10 – 2
= 20 – 2
= 18
20 – 14 =
20 – 18 =
30 – 11 =
30 – 21 =
- 24 – 6 = 10 + 14 – 6
= 10 + 8 =
= 18
26 – 8 =
23 – 7 =
25 – 6 =
21 – 4 =
- Efectueaza :
10 – 2 = 16 – 7 =
12 – 9 = 11 – 2 =
21 – 4 =
25 – 6 =