Calculo mental2
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Transcript of Calculo mental2
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OA 4Describir y aplicar estrategiasde cálculo mental para las adicionesy sustracciones hasta100:› por descomposición› completar hasta la decenamás cercana› usar dobles› sumar en vez de restar› aplicar la asociatividad
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MatemáticaMatemática 2017
Educación Básica
3°Año A
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Desafío mental 1A Brasil viajaron 570 chilenos, solo 474
personas tenían entradas para ver a su equipo.¿Cuántas personas quedaron sin entrar
al estadio? Operación:
Respuesta: Quedaron sin entrar al estadio
personas.
5 7 0 4 7 4 -
6 9 0 96
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Desafío mental 2La delegación de futbol de Brasil tiene 45 personas , la de Chile 65 personas y la de Argentina tiene 54 personas. ¿Cuántas personas forman las tres
delegaciones?Operación:
Respuesta:
4 5 6 5 5 4
4 1 6+
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Objetivo de la claseObjetivo de la clase
Aplicar estrategia para el cálculo mental.
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Cálculo mentalSuma usando el cálculo mental58 40+ =
36 43+ =
69 20+ =
389 500+ =
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258 100+ =
689 10+ =
350 200+ =
747 30+ =
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Redondeo Redondea los sumandos a la decena mas cercana. 67 42+ 56 38+
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68 12+ 35 47+
21 36+ 57 45+
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