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1 dm= 10 cm
15 dm= 15×10= 150 cm
1m= 100 cm
2m = 2x100= 200 cm
200 - 150 = 50 cm
R. Le faltan 50 cm para medir 2 m
1 decímetro son 10 centímetros.
Es decir guille mide
-1 metro + 1 decímetro = 1,10 m
= 2 m - 1,10 m
= 9 decímetros * 10 cm
= 90 cm