ACTIVIDAD 1

x 70% =
2. 400 x 0.7 = 280


3. ?% x 40 = 28
= 28/40
= 0.7
= 70%


4. 24 x 25% =
24 x 0.25 = 6
24+6=30


5. 75% x 48 =
0.75 x 48 = 36


6. 13% x ? = 1,440
= 1,440/0.13
= $ 11,076.92


7. 20% x 456 =
0.20 x 456= 91.20


8. 75% x ? =15
= 15/0.75
= 20
9. 80% x ? = 12,500
= 12,500 / 0.80
= 15, 625.00


10. 72/ 90 = 0.75
=75%


TAREA 1
Razón
1. 20:25 20/25 = 4/5


2. 12:4 12/4 = 6/2


3. 10:8 10/8 = 5/4


4. 3 1/5 / 6 = 3 1/5 / 6 = 16/5 x 1/6 = 16/30




-6:3 6/3

-6:9 6/9= 2/

-33:9 3/9 = 1/3




5. 32:8 32/8 = 8/2


6. 128:16 128/16 = 16/2


TAREA 2

Proporción



1. x/20 = 3/5


5x = 20x3
5x = 160/5
x = 12


2. 12/x = 9/8


9x = 12x18
= 216/18
= 12


3. 5/3 = x/6


3x = 5x6
3x = 30
x= 30/3
x= 10


4. 5:11 = 15:x 5/11=15/x


5x = 15x11
5x = 165
x = 165/5
x = 33


5. x:3 = 4:6 x/4 = 4/6


6x = 4x3
6x = 12
x = 12/6
x = 2


6. 50/3 = x/75

3x = 50x75
3x= 3,750
x= 3,750/3
x= 1,250


7. 33/ 1 = x / 85


x= 33x85
= 2,805


8. 16/x = 2.5/ 300


2.5x= 16x300
x= 4,800/2.5
x= 1,920


9. 118/x = 2/24


2x= 118x24
x = 2,833/2
x= 1,416

TAREA 1 

Razón



1. 20/28 = 10/16


2. 9/36 = 3/12


3. 15 pulgadas/3 pies = 15 pulgadas/36 pulgadas = 5/12


4. 40cm/ 3m = 40cm/300cm= 20/150 = 2/15


5. 240millas/8galones = 30/1galones


6. 220galones/20minutos = 11galones/1minuto



TAREA 2


 Proporción

1. 83/41 = 74/43 = NO


2: 125/45 = 25/9 = SI


3. 9/4 = 27/12 = 9x12 = 108
= 27x4 = 108


4. x/18 = 7/9


9x = 18x7
9x/9 = 126/9
= 14


5. 3/x = 8/64


8x = 3x64
8x/x = 192/8 = 24