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80mm=8
400+8=408cm
maaf kalau salah
Kelas : -
Jawaban :
40 dm = ........ Cm
= 40 x 10
= 400 Cm
80 mm = ..........Cm
= 80 : 10
= 8 Cm
40 dm + 80 mm
= 400 cm + 8 cm
= 408 cm
Jawabannya adalah 408 cm