Listen and follow along in your books as the following series of numbers are read on the tape. Now listen again, with your books closed. Repeat after the speaker:
a. 100--50--20--40-30-60--90--70
b. 70--90--60--30--40-20-50--100
с. 40-20-30--10- 50--70--90-60
d. Look at the pictures and count.