order of operations order of operations

Correct or wrong?

100

(5-2) + 12 - 5 = 14

  

wrong. Correct answer is 10

200

(23-12)+5= 16

correct

300

4.5-2+12= 14.2

correct

400

(6.7-3.4)+12=16.3

wrong. Correct answer is 15.3

500

(34+9.8)- 20= 23

wrong. correct answer is 23.8

order

100

(5+9) - 6 + 56 

(5+9)-6+56

 14-6+56

 8+56 

 =64    

200

5+7(10-6)+5

5+7 x (10-6)+5

 5+ 7 x 4 +5

  5 + 28 +5

33+ 5

38

300

13+ 10x9 

13+10x9= 103

400

4.3-1.2+38 =

41.1

500

(50-42)x 64

512

solve

100

(5-3)+12(y)

y = 6

74

200

5+(6-4)+8=

15

300

(4+21)-15+3=

25-15+3=18

10+3=13

400

(56+45)-23+7-6=

79

500

y + (24-8)y - y²

y = 8

72

Fraction to decimal

100

12/14

.857

200

16/17

.941

300

4/9

.444

400

8/12

.667

500

3/7

.428

Multiply decimals

100

1.9 x 0.4

0.76

200

2.8 x 0.6

1.68

300

0.3 x 3.4

1.02

400

9.1 x 0.3

2.73

500

8.3 x 6.4

53.12