22 cm.
2 dm=20 cm
22 cm-20 cm=2 cm
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1 dm = 1 cm → 1 dm² = 1 dm × 1 dm = 10 cm × 10 cm = 100 cm² → To convert dm² to cm² multiply by 100 → 5 dm² = 5 × 100 cm² = 500 cm².
1 dm = 10 cmso, (1 dm)2 = (10 cm)2 = 100 cm2
8
8
2 m