Question

7 m + 12 dm - 20 cm = mm

Answer 1

1 m = 1000 mm
1 dm = 100 mm
1 cm = 10 mm

7m + 12 dm - 20 cm
= (7*1000) + (12*100) - (20*10)
= 7000 + 1200 - 200
= 8200 - 200
= 8000

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Answer 2

7 m + 12 dm - 20 cm=
7000 mm + 1200 mm - 200 mm = 8000 mm