Test: Arithmetic IV - Challenging

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Question 1:   Calculate: 3 7 : 1 4
5 7
3 28
2 4 7
1 5 7
Question 2:   Calculate: 74 1 8
3 1 8
1 1 8
2 7 8
2 1 8
Question 3:   Find the greatest common divisor of (18,45)
3
5
9
6
Question 4:   Find the least common multiple of ( 18,45 )
9
45
18
90
Question 5:   Calculate: ( 2 3 ) 3 ( 7 1 2 1 6 )
2 14 81
14 81
1 6
2 1 6
Question 6:   Find 4 7 of 28
20
16
8
10
Question 7:   Calculate: | 3.2+ 0.4 2 |
30.4
30.4
3.04
3.04
Question 8:   Calculate: 0.3×10016850:1000
13.15
1.315
13.15
1.315
Question 9:   Simplify: 9 2 + 8 + 50
9 60
2 2
2 2
9 60
Question 10:   How much the area of a rectangle with the sides 12.5 and 7.2 centimeters is smaller than the area of a square with the sides 11.1 centimeters?
3.321c m 2
3.321 m 2
33.21 m 2
33.21c m 2