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Numbers: cardinal, ordinal, fractions and decimals

A bit of theory

Cardinal numbers

1 one

2 two

3 three

4 four

5 five

6 six

7 seven

8 eight

9 nine

10 ten

11 eleven

12 twelve

13 thirteen

14 fourteen

15 fifteen

16 sixteen

17 seventeen

18 eighteen

19 nineteen

20 twenty

21 twenty-one

22 twenty-two, etc.

30 thirty

40 forty

50 fifty

60 sixty

70 seventy

80 eighty

90 ninety

100 a hundred/one hundred

0 = nought or zero. In telephone numbers we say it like the letter ‘O’. In football we say nil. In tennis we say love.

101

200

300

999

1,000

1,001

2,250

999,999

1,000,000

5,000,000

a hundred and one

two hundred (hundred does not have a plural s)

three hundred

nine hundred and ninety-nine

a thousand/ one thousand

a thousand and one

two thousand, two hundred and fifty (thousand has no plural s)

nine hundred and ninety-nine thousand, nine hundred and ninety-nine

a million/ one million

five million (million does not have a plural s)

Ordinal numbers

1st first

2nd second

3rd third

4th fourth

5th fifth

6th sixth

7th seventh

8th eighth

9th ninth

10th tenth

11th eleventh

12th twelfth

13th thirteenth

14th fourteenth

15th fifteenth

16th sixteenth

17th seventeenth

18th eighteenth

19th nineteenth

20th twentieth

21st twenty-first

22nd twenty-second

23rd twenty-third

24th twenty-fourth

25th twenty-fifth

26th twenty-sixth

27th twenty-seventh

28th twenty-eighth

29th twenty-ninth

30th thirtieth

31st thirty-first

Other examples

Fractions and decimals

½ = a half

¼ = a quarter

¾ = three quarters

1½ = one and a half

2¼ = two and a quarter

5¾ = five and three quarters

1.5 = one point five

2.25 = two point two five

5.75 = five point seven five

  1. Write the words as cardinal numbers.

  1. a hundred and nine

  2. eighty-seven

  3. two hundred and fifty-five

  4. three hundred and thirty-two

  5. nine hundred and ninety-eight

  6. two thousand and one

  7. two million

  8. two hundred thousand

  9. fifty one thousand, two hundred and ten

  10. four thousand, nine hundred and twelve

……109……

……………..

……………..

……………..

……………..

……………..

……………..

……………..

……………..

……………..

  1. Write the cardinal numbers as words.

  1. 18

  2. 90

  3. 49

  4. 71

  5. 8

……eighteen……

………………….

………………….

………………….

………………….

  1. 64

  2. 97

  3. 23

  4. 14

  5. 56

………………….

………………….

………………….

………………….

………………….

  1. Write the ordinal numbers as words.

  1. 3rd

  2. 9th

  3. 21st

  4. 30th

  5. 14th

…..…third…..…

…………………

…………………

…………………

…………………

  1. 5th

  2. 2nd

  3. 43rd

  4. 1st

  5. 10th

…………………

…………………

…………………

…………………

…………………

  1. Choose the best answer.

  1. 296

  1. 5,695

  1. 10,000,000

  1. 5.75

  1. ¾

  1. 200,000

  1. 17.98

= 1) two thousand, nine hundred and sixty

2) two hundred and ninety-six

= 1) five thousand, six hundred and ninety-five

2) fifty six hundred and nine and five

= 1) ten hundred thousand

2) ten million

= 1) five point seven five

2) five comma seventy-five

= 1) four thirds

2) three quarters

= 1) a one and half

2) one and a half

= 1) two hundred thousand

2) two hundred thousands

= 1) seventeen point nine eight

2) one seven point nine eight