Mathematics
Grade 1
15 min
Ordinal numbers up to 10th
Ordinal numbers up to 10th
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1
Introduction & Learning Objectives
Learning Objectives
Define what an ordinal number is and differentiate it from a cardinal number.
Correctly identify the ordinal numbers from first to tenth.
Write the word form and numerical form of ordinal numbers up to 10th.
Correctly use the suffixes -st, -nd, -rd, and -th for ordinal numbers.
Apply ordinal numbers to describe position or order in real-world scenarios.
Spell the ordinal numbers from first to tenth accurately.
Have you ever wondered who finished 🥇 in a race or which day of the week comes 🗓️ after Tuesday? These questions use special numbers!
In this lesson, you will learn about ordinal numbers, which tell us the position or order of things. Understanding these numbers is crucial for describing sequences, rankings, and events in our daily lives, from spo...
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Key Concepts & Vocabulary
TermDefinitionExample
Ordinal NumberA number that tells the position or order of something in a sequence, rather than the quantity.First, second, third, fourth, fifth, etc.
Cardinal NumberA number that tells 'how many' of something there are; it represents quantity.One, two, three, four, five, etc.
PositionThe place where someone or something is located in relation to others in a sequence or arrangement.If you are the 'third' person in line, that is your position.
SequenceA particular order in which related things follow each other.The sequence of days in a week: Monday, Tuesday, Wednesday...
SuffixA letter or group of letters added to the end of a word to form a new word or to change its grammatical function.In 'first', '-st' is the suffix. In ...
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Core Formulas
Suffix for 1st, 2nd, 3rd
For the numbers 1, 2, and 3, the ordinal suffixes are unique: 1st (first), 2nd (second), 3rd (third).
These are special cases and do not follow the general 'th' rule. Always remember 'st' for one, 'nd' for two, and 'rd' for three.
General Suffix for 4th to 10th
For most other numbers, including 4 through 10, the ordinal suffix is 'th'. For example, 4th, 5th, 6th, 7th, 8th, 9th, 10th.
After the first three, the 'th' suffix is generally used. This rule applies to most ordinal numbers beyond 3rd.
Spelling Changes for Fifth, Eighth, Ninth
Some ordinal numbers have slight spelling changes from their cardinal forms: 'five' becomes 'fifth', 'eight' becomes '...
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Challenging
A pattern of shapes repeats in this order: Circle, Square, Triangle, Star. What is the ninth shape in the sequence?
A.Circle
B.Square
C.Triangle
D.Star
Challenging
There are 10 contestants in a science fair. If Maria won the fourth prize, how many contestants placed after her (assuming prizes are awarded from first to tenth)?
A.Five
B.Four
C.Seven
D.Six
Challenging
Which of the following questions must be answered with an ordinal number?
A.How many laps did you run?
B.In which place did you finish the race?
C.What was your final time?
D.How many people were in the race?
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