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Más ( + ) es el signo de la suma
si
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6+4=
10
Oops!
Okay!
7+3=
10
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Okay!
Si tengo 10 lápices, tengo una decena de lápices.
si
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Una decena es un conjunto de 10 unidades.
si
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1+7=
8
Oops!
Okay!
6+3=
9
Oops!
Okay!
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