2
Names of 21 to 30
Joyful Mathematics: Chapter 8
GoalSay and write the number names from twenty-one to thirty.
New words
twenty · the name for 2 tensthirty · the name for 3 tensnumber name · the way we say a number in words
Explanation
Every number has a name. 21 is twenty-one. 22 is twenty-two. We say the tens word first, then the ones word. After twenty-nine comes thirty. Thirty is written 30.
| Number | Name | Number | Name |
|---|---|---|---|
| 21 | twenty-one | 26 | twenty-six |
| 22 | twenty-two | 27 | twenty-seven |
| 23 | twenty-three | 28 | twenty-eight |
| 24 | twenty-four | 29 | twenty-nine |
| 25 | twenty-five | 30 | thirty |
Worked examples
25 is twenty-five. Say twenty, then five.
29 is twenty-nine. One more makes 30, thirty.
Tenzin’s house number is 27. We say it twenty-seven.
Class activity
Number name cards. Write the numbers 21 to 30 on ten small papers. Show one paper and say its name aloud. Then a friend says a name, and you pick the right paper.
Practice
1
How do we say 24?
Twenty-four.
2
Write twenty-seven as a number.
27
3
Two numbers in the grid are hidden by a question mark. Which numbers are they?
23 and 26.
4
What comes after twenty-nine? Say its name and write it.
Thirty, 30.
5
Which is more, twenty-two or twenty-eight?
Twenty-eight.