Tính (theo mẫu):
1dm + 1dm = 2dm 5dm – 3dm = 2dm
2dm + 3dm = 10dm – 5dm =
7dm + 3 dm = 18dm – 6dm =
8dm + 10dm = 49dm – 3dm =
a) 1dm + 1dm = 2dm
2dm + 3dm = 5dm
7dm + 3dm = 10dm
8dm + 10dm = 18dm
b) 5dm−3dm = 2dm
10dm−5dm = 5dm
18dm−6dm = 12dm
49dm−3dm = 46dm
-- Mod Toán 2
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