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5. Activitats i autoavaluació

Activitats de raonament

Duración:
25:00
Agrupamiento:
1

1. Vols multiplicar 104 × 12. Tens poc de temps. Quin mètode triaries? Justifica-ho.
(No cal fer el càlcul, sinó explicar el perquè de l’elecció.)

2. T’ensenyen una taula d’un mètode egipci i et diuen que el resultat final és 360. Pots deduir quins dos nombres es van multiplicar?
(Pista: alguna de les columnes és 288)

3. En l'algoritme egipci, si volem calcular 19 × 15, quines files utilitzarem?
a) 1, 2, 8
b) 1, 2, 4, 8
c) 1, 2, 4, 16
d) 1, 2, 16

4. Càlcul fet per un company amb el mètode japonés: 21 × 13 = 423
És correcte? Explica com ho comprovaries amb un altre mètode.

Problema amb el mètode egípci

Resol el següent problema únicament utilitzant el mètode egípci de multiplicació: Karim prepara racions de menjar per a una gran celebració. Cada ració inclou 26 dàtils, i ha de preparar-ne 57. Quants dàtils necessitarà en total? Utilitza exclusivament l’algorisme egipci per calcular la quantitat total de dàtils.

Dàtils

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Karim prepara racions de menjar per a una gran celebració. Cada ració inclou 26 dàtils, i ha de preparar-ne 57. Quants dàtils necessitarà en total? Utilitza exclusivament l’algorisme egipci per calcular la quantitat total de dàtils.

Dàtils

Descompon el 57 com a suma de potències de 2 i fes les duplicacions de 26.

Su navegador no es compatible con esta herramienta.

Problema amb el mètode japonés

Hatsuki vol embolicar 34 regals, i per a cada regal fa servir 27 centímetres de cinta. Quants centímetres de cinta utilitzarà en total? Resol-ho utilitzant només el mètode japonés de les línies.

regalo japó

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Hatsuki vol embolicar 34 regals, i per a cada regal fa servir 27 centímetres de cinta. Quants centímetres de cinta utilitzarà en total? Resol-ho utilitzant només el mètode japonés de les línies.

regalo japó

Descompon 34 i 27 en desenes i unitats, dibuixa les línies corresponents i compta les interseccions per diagonal

Su navegador no es compatible con esta herramienta.

Preguntes tipus test d'autoevaluació

Pregunta

1. Quin dels següents avantatges destaca del mètode japonés de multiplicació?

Respuestas

a) Requereix dominar perfectament les taules de multiplicar

b) És molt ràpid amb nombres grans

c) Facilita la visualització del procés multiplicatiu

d) És més eficient que qualsevol altre mètode

 

Retroalimentación

Pregunta

2. Quina operació es fa en primer lloc en l’algoritme egipci?

Respuestas

a) Comptar interseccions entre línies

b) Sumar totes les potències de 2

c) Descompondre el multiplicador en potències de 2

d) Repartir fitxes en columnes iguals

Retroalimentación

Pregunta

3. Quin dels següents és un exemple de propietat distributiva?

Respuestas

a) 5 × 4 = 4 × 5

b) 5 × (2 + 3) = 5 × 2 + 5 × 3

c) (2 × 3) × 4 = 2 × (3 × 4)

Retroalimentación

Pregunta

4. Per què el mètode egipci pot ser útil per a alumnes amb dificultats d’aprenentatge?

Respuestas

a) Es basa en una lògica clara i en passos senzills

b) És altament visual i artístic

c) Requereix molta memòria a curt termini

Retroalimentación

Pregunta

5. Quina d’aquestes afirmacions és una idea clau del projecte?

Respuestas

a) Tots els alumnes han d’usar el mateix mètode per multiplicar

b) Només el mètode tradicional és útil a l’aula

c) Hi ha múltiples camins per arribar al mateix resultat

Retroalimentación

Creado con eXeLearning (Ventana nueva)