Tính (theo mẫu):
1kg + 2kg = 3kg
16kg + 10kg = …..
27kg + 8kg = …..
30kg – 20kg = …..
26kg – 14 kg = …..
10kg – 4kg = …..
1kg + 2kg = 3kg
16kg + 10kg = 26kg
27kg + 8kg = 35kg
30kg – 20kg = 10kg
26kg – 14 kg = 12kg
10kg – 4kg = 6kg
-- Mod Toán 2
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