Present numbers in the form of the sum digit composed 354 =, 642 =, 438 =, 571 =, 634 cm =, 829 cm =.

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354=300+50+4=3c.5 of 4 units 642=600+40+2=6c.4 of 2 units 438=400+30+8=4s.3d.8 unit 571=500+70+1=5c.7 of 1 unit 634=600+30+4=6c.3D. 829=800+20+9=8c.2 of 9 pieces.
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Answer add