一、将下列数字按从大到小的顺序排列,并抄写在四线三格中。
fifteen eighteen twelve sixteen twenty

twenty eighteen sixteen fifteen twelve

二、算一算,在横线上填入正确数词的序号。
A. eighteen B. fourteen C. seventeen
D. thirteen E. nineteen F. eleven
1. two×nine-five=
2. four×six-seven=
3. five+two×three=
4. sixteen÷two+six=
5. seven×two+five=
6. twenty-three+one=

1. D 2. C 3. F 4. B 5. E 6. A