1. Module 1 Unit 2 More practice Sun zhuo No.145 Middle School

3. Read the passage of the title, the subtitle ‘Ancient number’ and ‘zero’, then discuss in groups to answer the following questions. 1.Everyone’s language is_______ A. his or her own language B. English C. his or her own language and the international language of numbers D. Chinese 2.In ancient times, there were (was)________ A. the same way of writing numbers B.1 to 9 system C. zero D. different ways of writing numbers C D

4. 3.The system of number that nearly everyone uses today consists of______ A. the numbers from 1to 9 B. the numbers from 1to 9 and 0 C. zero D. the biggest number and the smallest number 4.________invented and developed the ten numbers. A. Chinese B. Arabs C. Romans D. Indians 5.___________is the main idea of this part. A. Numbers B. Ancient numbers C. Zero D. The history of numbers B D D

6. 1.Was abacus one of the first calculating machine? 2.Why do people still use abacuses today? 3.What can a modern electronic calculator do? 4.How long does a computer do a calculation? 5.Is a very powerful calculating machine a modern electronic calculator or a computer? Yes. Abacuses are fast and accurate. It can add, subtract, multiply and divide. It can also calculate percentages and square roots. In a flash. A computer.

7. a.ancient numbers b.1-------9 c.zero a.the brain b.abacuses c.modern electronic calculators d.computers e.the living computer=the brain VS the computer f…………. The history of numbers: The development of calculating machines:

8. Bye Welcome to our class again