Question

×calcule- *porcentagem*

1) 20% de 500
2) 12% de 36
3) 2% de 20
4) 15% de 200
5) 8% de 850
6) 25% de 38
7) 45% de 3900
8) 50% de 8596
9) 10% de 128
10) 3% de 45
​

Answer 1

1 ) 500 x 20 = 10.000 ÷ 100 = 100

2 ) 36 x 12 = 432 ÷ 100 = 4,32

3 ) 20 x 2 = 40 ÷ 100 = 0,4

4 ) 200 x 20 = 4000 ÷ 100 = 40

5 ) 850 x 8 = 6800 ÷ 100 = 68

6 ) 38 x 25 = 950 ÷ 100 = 9,5

7 ) 3900 x 45 = 175500 ÷ 100 = 1755

8 ) 8596 x 50 = 429800 ÷ 100 = 4298

9 ) 128 x 10 = 1280 ÷ 100 = 12,8

10 ) 45x 3 = 135 ÷ 100 = 1,35

Answer 2

1) 20% de 500
= 20/100 . 500
= 2/10 . 500
= 500/10 . 2
= 50.2
= 100
____________
2) 12% de 36
= 12/100 (:2)/(:2). 36
= 6/50 . 36
= 216/50 . 2/2
= 432/100
= 4,32
____________

3) 2% de 20
= 2/100 (:2)/(:2) . 20
= 1/50 . 20
= 2/5
= 0,4
____________

4) 15% de 200
= 15/100 . 200
= 200/100 . 15
= 2.15
= 30
______________
5) 8% de 850
= 8/100 (:4)/(:4) .850
= 2/25. 850
= 850/25 (:5)/(:5) . 2
= 170/5 . 2
= 34.2
= 68
________________
6) 25% de 38
= 25/100 (:25)/(:25). 38
= 1/4 . 38
= 38/4 (:2)/(:2)
= 19/2
= 9,5

______________
7) 45% de 3900
= 45/100 . 3900
= 39.45
= 1755

¬39
x45
-------
¬195
156+
----------
1755


_______________
8) 50% de 8596
= 50/100 . 8596
= 5/10 . 8596
= 1/2 . 8596
= 4298
____________
9) 10% de 128
10/100 . 128
= 1/10 . 128
= 12,8
_____________
10) 3% de 45
= 3/100 . 45
= 135/100
= 1,35
____________