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1999 2021 2021 thirteen, twenty fifteen, fortysix thirteen, seventyeight seventeen, eightyfive eighteen, seventytwo nieen, niynine two thousand two thousand and seven . Wu has two children. The first child is a boy. The second is a girl. Ordinal numbers 2. There are five floors in our teaching building. Our classroom is on the third floor. 3. There are seven days in a week. Wednesday is the fourth day of a week. Thursday is the fifth day of a week. ordinal number序數(shù)詞 1 = one 1st = first 2 = two 2nd = second 3 = three 3rd = third 4 = four 4th = fourth 5 = five 5th = fifth 6 = six 6th = sixth 7 = seven 7th = seventh 8 = eight 8th = eighth 9 = nine 9th = ninth 10 = ten 10th = tenth 11 = eleven 11th = eleventh 12