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Numbers & Numeration

Ordinal number: a number used to tell order or position.

Ordinal numbers

1st first
2nd second
25th twenty-fifth
50th fiftieth
100th one hundredth
500th five hundredth

 

Alphabet

1st 2nd 3rd 4th 5th

first second third fourth fifth

 

When you read a calendar, you use ordinal numbers.

August

Sunday

Monday

Tuesday

Wednesday

Thursday

Friday

Saturday

        1 2 3
4 5 6 7 8 9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29 30 31
August is the eighth month.
August 1st is on Thursday.

 

Remember: Ordinal numbers tell order or position.
  • 4th grade
  • 10th floor
  • twenty-fifth anniversary
  • hundredth birthday

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