Calcule 25 %de 300 b) 80% de 1.200 c) 9 % de 50.000 d) 31 % de 2.500 e) 43% de 7.200 f) 8% de 32500
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a) 25% de 300
300 --- 100
x --- 25
300 × 25 =7.500
100 × x = 100x
x = 7500 ÷ 100
x= 75
b) 80% de 1200
1200 --- 100
x --- 80
1200 × 80 = 96000
100 × x = 100x
x = 96.000 ÷ 100
x = 960
c) 9% de 50.000
50.000 --- 100
x --- 9
50.000 × 9 = 450.000
100 × x = 100x
x = 450.000 ÷ 100
x = 4.500
d) 31% de 2.500
2500 --- 100
x --- 31
2500 × 31 = 77.500
100 × x = 100x
x = 77.500 ÷ 100
x = 775
e) 43% de 7200
7200 --- 100
x --- 43
7200 × 43 = 309.600
100 × x = 100x
x = 309.600 ÷ 100
x = 3.096
f) 8% de 32.500
32.500 --- 100
x --- 8
32500 × 8 = 260.000
100 × x = 100x
x = 260.000 ÷ 100
x = 2.600
300 --- 100
x --- 25
300 × 25 =7.500
100 × x = 100x
x = 7500 ÷ 100
x= 75
b) 80% de 1200
1200 --- 100
x --- 80
1200 × 80 = 96000
100 × x = 100x
x = 96.000 ÷ 100
x = 960
c) 9% de 50.000
50.000 --- 100
x --- 9
50.000 × 9 = 450.000
100 × x = 100x
x = 450.000 ÷ 100
x = 4.500
d) 31% de 2.500
2500 --- 100
x --- 31
2500 × 31 = 77.500
100 × x = 100x
x = 77.500 ÷ 100
x = 775
e) 43% de 7200
7200 --- 100
x --- 43
7200 × 43 = 309.600
100 × x = 100x
x = 309.600 ÷ 100
x = 3.096
f) 8% de 32.500
32.500 --- 100
x --- 8
32500 × 8 = 260.000
100 × x = 100x
x = 260.000 ÷ 100
x = 2.600
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