1. unitati de ordinul 5
2. 50907= 50000+ 900 + 7
5 x 10000 + 9 x 100 + 7 x 1
234080= 200000+ 30000 +4000+ 80
234080= 2 x 100000 + 3 x 10000 + 4 x 1000 + 8 x 10
3. 3999, 4001 , 4003
899998, 900000, 900002
207206, 207208, 207210
56897, 56899, 56901
4. 30 999, 30 777, 30 555, 30 333, 30 111
12, 123 ,1234 ,12345 ,123456
900000, 900003, 600003, 600006, 300006, 300009 , 100009
5. 9000<10000<250000>234567>3000<4000
55111>60<70<666666=666666
3000>2018<1000000>999999>10=10