Unit2 Grammar课件2022-2023学年沪教牛津版八年级英语上册

Unit 2 Numbers Grammar 1 We use cardinal numbers to count things. Cardinal numbers one two three four five six seven eight nine ten eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen twenty thirty forty fifty sixty seventy eighty ninety one hundred We use cardinal numbers to count things. • In the cardinal numbers, we do not add -s to hundred, ________ and ______________ . • With large numbers, we put ______________ between hundred and ten. thousand million and Complete “Work out the rule”. 4 We use ordinal numbers to show the order of things. 1st first 7th seventh 13th thirteenth 19th nineteenth 2nd second 8th eighth 14th fourteenth 20th twentieth 3rd third 9th ninth 15th fifteenth 21st twenty-first 4th fourth 10th tenth 16th sixteenth 33rd thirty-third 5th fifth 11th eleventh 17th seventeenth 40th fortieth 6th sixth 12th twelfth 18th eighteenth 100th hundredth 2 Work out the rule We form most ordinal numbers by adding ________to the cardinal numbers. There are exceptions, like first, second and third. -th The students are standing in a line. They each have a number (from 1 to 28). Fill in the blanks with cardinal numbers on the left and ordinal numbers on the right. first 2 third fourth twelfth 19 twenty-third twenty-eighth Instructions about numbers 3 add … and … subtract … from … multiply … by… divide … by … How to give instructions? Read the instructions aloud. 2+10 10-2 2*10 10÷2 Add 2 and 10. Subtract 2 from 10. Multiply 2 by 10. Divide 10 by 2. How to express equtions? 4 We can use equals or is to express “=”. Things to remember Plus and minus are prepositions. 10 Read the statements aloud. 2+10 = 12 10 - 2 = 8 2* 10 = 20 10÷2 = 5 2 plus 10 equals/is 12. 10 minus 2 equals/is 8. 2 multiplied by 10 equals/is 20. 10 divided by 2 equals/is 5. In pairs, complete the sentences like those in Table I and Table II. Instructions about numbers