Câu 3. Tính theo mẫu:

Mẫu: 2dam+3dam=5dam

24dam – 10dam=14dam

25dam+50dam=45dam – 16dam=

8dam+12dam=67 dam – 25dam=

36dam+18dam=72dam – 48dam=

Giải:

25dam+50dam=75dam 45dam – 16dam=29dam

8dam+12dam=20dam 67 dam – 25dam=42dam

36dam+18dam=54dam 72dam – 48dam=24dam.