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**assistance required for following plz**

3 questions that have driven me up the wall

**1. Homework Statement**

0.5km2 is the same area as

a)5x10*6m2

b)5x10*12mm2

c)5x10*9cm2

d)5x10*13mm2

**2. Homework Equations**

10*6m=1km2

**3. The Attempt at a Solution**

0.5x10*6= 500,000 the answer is a) i dont understand what iv done wrong

q2

**1. Homework Statement**

0.04m3 is the same volume as

a)4x10*6mm3

b)40dm3

c)4x105cm3

d)4x10*2dm3

**2. Homework Equations**

in 1m3=10*9mm

1x10*9x0.04=4x10*7??

**3. The Attempt at a Solution**

the answer is a)

**1. Homework Statement**

5x10*8mm2 is the same as

a)500cm2

b)5x10-4km2

c)5m2

d)5x10-2m2

my workings

10*6mm=1m2

1/10*6=1x10-6

1x10-6x5x10*8=5x10*2

the answer is d my answer doesnt come as -2 as it should