
Fraccions 2n ESO
Authored by Silvia Puertas
Mathematics
2nd Grade
Used 2+ times

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8 questions
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1.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
21/49
22/33
2/10
1/2
Answer explanation
Multipliquem 7 a la fracció
3/7, al numerador i al denominador.
Resultat 21/49
3 x 7 = 21
7 x 7 = 49
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
5/3
2/3
3/5
6/6
Answer explanation
Simplifiquem: 100/150
> Dividim entre 50
Numerador: 100/50 = 2
Denominador: 150/50 = 3
Resultat: 2/3
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
5/12
7/18
1/6
2/3
Answer explanation
2/9 + 5/6 - 2/3
Busquem el MCM (9,6,3) = 18
4/18 + 15/18 - 12/18 = 7/18
4.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
-7/8
1/10
-6/5
2/10
Answer explanation
1. Convertim a fracció.
2. Calculem les operacions dins els parèntesis.
3. Busquem MCM per trobar els denominadors comuns de cada operació.
4. Quan tenim fet el càlcul de dins del parèntesis el treim i seguim fent.
Ordre de càlculs: primer multiplicació i després restes.
5.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
La família de l'Àlex ha comprat una nevera que costa 666€. N'ha pagat 5/9 parts al comptat i pagaran la resta en 8 terminis mensuals sense interès. Quant han de pagar cada mes?
37€
46,25€
149,85€
108€
Answer explanation
Total = 666€
5/9 = al comptat
total 9/9 - comptat 5/9 = 4/9 (terminis)
Busquem la quantitat de cada fracció:
666€ x 1/9 = 74€
Calculem la quantitat a terminis = 74€ x 4 parts = 296€
296€ /8 terminis = 37€ al mes
6.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
L'Àlex ha gastat 3/10 dels diners que tenia estalviats en la compra d'un còmic. Si li queden 21€, quant ha costat el còmic?
17€
9€
7€
10€
Answer explanation
Queden 21€ = 7/10
Total = 10/10
Gastat = 10/10 - 7/10 = 3/10
1/10 = 21€/7 = 3€
Gastat = 3€ x 3 parts = 9€
7.
MULTIPLE CHOICE QUESTION
10 mins • 2 pts
En un quiosc han venut aquest matí 3/5 del total dels diaris rebuts i per la tarda 1/6 (també del total). Si els queden 21 diaris, quants n'han rebut?
125 diaris
35 diaris
90 diaris
30 diaris
Answer explanation
Diaris venuts = 3/5+1/6 = 23/30
Queden 21 diaris = 30/30 - 23/30 = 7/30
Busquem 1/30
21 diaris = 7/30
21/7 = 1/30
3 diaris = 1/30
Total diaris 30/30
3 diaris x 30parts = 90 diaris rebuts
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