- English as a Second Language (ESL)
- Addition and subtraction
- Age 7-11
-
level: tercero de primaria
- English
Author's Instructions
ACTIVIDAD DE CÁLCULO MENTAL
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- English as a Second Language (ESL)
- Addition and subtraction
- Age 7-11
- level: tercero de primaria
- English
Author's Instructions
ACTIVIDAD DE CÁLCULO MENTAL