1) 3×10 = 30 (a treia zece)
31,32,33,34,35,36,37,38,39.
2) 3×100 = 300 (a treia suta)
301,302,303,...,398,399.
3) 5×100 = 500 (a cincea suta)
502,504,506,...,596,598.
4) 9×10 = 90 (a noua zece)
91,93,95,97,99.
5) 9 × 100 = 900 (a noua suta)
901,903,905,...,995,997,999.
