Cardinal Numbers

0 – zero

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

23 – twenty-three

24 – twenty-four

25 – twenty-five

30 – thirty

31 – thirty-one

32 – thirty-two

33 – thirty-three

34 – thirty-four

35 – thirty-five

40 – forty

50 – fifty

60 – sixty

70 – seventy

80 – eighty

90 – ninety

100 – a hundred, or one hundred

101 – a hundred and one

102 – a hundred and two

110 – a hundred and ten

111 – a hundred and eleven

200 – two hundred

300 – three hundred

1,000 – a thousand, or one thousand

2,000 – two thousand

1,000,000 – a million, or one million

1,000,000,000 – a billion, or one billion

1,000,000,000,000 – a trillion, or one trillion

Ordinal Numbers

1st – first

2nd – second

3rd – third

4th – forth

5th – fifth

6th – sixth

7th – seventh

8th – eighth

9th – ninth

10th – tenth

11th – eleventh

12th – twelfth

13th – thirteenth

14th – fourteenth

20th – twentieth

21st – twenty-first

22nd – twenty-second

23rd – twenty-third

24th – twenty-forth

25– twenty-fifth

30th – thirtieth

31 – thirty-first

32 – thirty-second

33rd – thirty-third

34th – thirty-forth

35th – thirty-fifth

40th – fortieth

50th – fiftieth

60th – sixtieth

70th – seventieth

80th – eightieth

90th – ninetieth

100th – a hundredth, or one hundredth

1,000th – a thousandth, or one thousandth

1,000,000th – a millionth, or one millionth

1,000,000,000th – a billionth, or one billionth

1,000,000,000,000th – a trillionth, or one trillionth

Fractional Numbers

1/2 – half

1/3 – a third, or one third

3/4 – three quarters

5/8– five-eights

1 1/4 – one and a quarter, or one and one quarter

2 2/3 – two and two thirds

3 15/16 – three and fifteen-sixteens

1/10 – a tenth, or one tenth

1/20 – one twentieth

1/100 – one hundredth

Equations

3 > 1 – three greater than one

1 < 3 – one less than three

1 + 5 = 6 – one plus five equals six

5 – 1 = 4 – five minus one equals four

1 – 5 = -4 – one minus five equals minus four

10 x 10 = 100 – ten times ten equals a hundred

100 % 10 = a hundred divided by ten equals ten

2<sup>2</sup> = 4 – two squared equals four

3<sup>3</sup> = 3 – three cubed equals twenty-seven

√4 = 2 – the square root of four is two

<sup>3</sup>√27 = 3 – the cube root of twenty-seven is three

10 <sup>4</sup> = 10,000 – ten to the fourth power equals ten thousand

Irrational Numbers

π – pi

e – ee

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