Which equation is equivalent to 6.5m?
a) 25 dm + 300cm + 1100mm
b) 3m + 25cm + 24dm + 100cm
c) 0.003km + 30cm + 21dm + 1100mm d) 3.2m + 1100mm + 12dm
d) 3.2m + 1100mm + 12dm

First, we should convert everything into meter
a) 2.5m + 3m + 1.1m
b) 3m + .25m + 2.4m + 1m
c) 3m + .3m + 2.1m + 1.1m
d) 3.2m + 1.1m + 1.2m

And it looks like answer D will give you the correct answer. If you want to know how I got the units, here's how:
1m = 10dm                  1m = 10dm = 100 cm = 1000mm
1dm = 10cm                 
1cm = 10mm

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Use photo math it