Counting by tens means listing numbers that increase by 10 each time. This helps with quick calculations, understanding place value, and recognizing patterns in numbers.
Counting by Tens Vocabulary
Here are the numbers when counting by tens from 10 to 100:
| English | Example Sentence |
|---|---|
| ten | There are ten apples in the basket. |
| twenty | She has twenty pencils. |
| thirty | I walked thirty blocks today. |
| forty | The book costs forty dollars. |
| fifty | We need fifty chairs for the event. |
| sixty | He ran sixty miles last week. |
| seventy | The recipe calls for seventy grams of sugar. |
| eighty | The concert starts in eighty minutes. |
| ninety | Ninety students attended the lecture. |
| one hundred | The building is one hundred feet tall. |
Ordinal Numbers by Tens
When counting by tens with ordinal numbers (telling position or order), use the following forms:
| Ordinal Number | Example Sentence |
|---|---|
| tenth | She finished in tenth place. |
| twentieth | Today is the twentieth of the month. |
| thirtieth | His birthday is on the thirtieth. |
| fortieth | The fortieth anniversary is next year. |
| fiftieth | They celebrated their fiftieth wedding. |
| sixtieth | The sixtieth floor has a great view. |
| seventieth | The seventieth episode was exciting. |
| eightieth | She lives on the eightieth street. |
| ninetieth | The ninetieth customer received a prize. |
| one hundredth | He was the one hundredth visitor today. |
Choose the correct ordinal number: Today is the _____ of the month.
twentieth
The example sentence specifies the twentieth of the month, so 'twentieth' is the correct choice.
Usage Patterns
- Use and before the last number in British English (e.g., “one hundred and ten”).
- In American English, and is often omitted (e.g., “one hundred ten”).
- For ordinal numbers beyond twenty, use the same suffix (-th), unless it ends in 1, 2, or 3 (e.g., twenty-first, twenty-second, twenty-third).
- Tens are always spelled out in full when written as words.
Tips for Counting by Tens
- Practice by skipping count aloud: “ten, twenty, thirty…” up to 100 or beyond.
- Use real-life examples: counting money, inventory, or steps.
- Remember ordinal numbers are used for dates, rankings, and sequences.
Counting by tens is a simple yet powerful skill for everyday math and communication.
Flashcards (1 of 10)
- Example Sentence: There are ten apples in the basket.
- English: ten
Last updated: Wed Jun 18, 2025
