FRACCIÓN DE UNA CANTIDAD

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Global Grade

Revision mode

En el colegio Escolapias Gandia hay 1.025 alumnos. Tres quintos de los alumnos van al colegio caminando. El resto lo hace en coche, en bici, en motocicleta o en autobús. ¿Cuántos alumnos van caminando al colegio?

Para averiguarlo calculamos 3/5 de 1.025.

Paso 1. Multiplica 1.025 por el numerador, 3.

1.025 x 3 = 3.075

Paso 2. Divide el producto obtenido entre el denominador, 5

3.075 : 5 = 615

3/5 de 1.025 = 615

Van caminando al colegio 615 alumnos.

RECUERDA:
Para calcular la fracción de una cantidad se multiplica la cantidad por el numerador y el resultado obtenido se divide entre el denominador.

Calcular la fracción de una cantidad es lo mismo que multiplicar un número por una fracción. Lo vemos en el siguiente ejemplo:

ACTIVIDADES

Relaciona.

Cinco octavos de 56
Seis novenos de 63
Dos tercios de 12
Cuatro doceavos de 72

Marca si la las siguientes afirmaciones son verdaderas o falsas.

Calcula en tu cuaderno.

a. 2/3 de 12

b. 5/9 de 27

c. 5/8 de 160

d. 4/11 de 1.056

e. 7/18 de 1.746

Calcula en tu cuaderno.

a. 2/5 de 100

b. 3/10 de 180

c. 4/10 de 80

Calcula en tu cuaderno.

a. 2/5 de 315 euros

b. 4/9 de 450 kilómetros

c. 3/10 de 1.000 metros

d. 5/20 de 800 litros

Un supermercado encargó 1.200 botellas de leche. El miércoles recibió un quinto de las botellas, el jueves tres octavos y el viernes el resto. ¿Cuántas botellas recibió el viernes? Calcula en tu cuaderno.

Un camión y su carga pesan 5.000 kg. El camión pesa dos octavos del peso total. ¿Cuántos kilos pesa la carga? Calcula en tu cuaderno.

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