Number Recognition
Reading, Writing, and Number Names 1 to 100
What is Number Recognition?
Number recognition means being able to see a number and know what it is. You can read it, write it, and say its name.
Reading Numbers:
When we read a number, we look at the digits and say the number out loud. For example: "7" is read as "seven".
Writing Numbers:
When we write a number, we draw the digits correctly. For example: to write the number five, we write the digit "5".
Number Names (1 to 20):
| Number | Number Name | Number | Number Name |
|---|---|---|---|
| 1 | one | 11 | eleven |
| 2 | two | 12 | twelve |
| 3 | three | 13 | thirteen |
| 4 | four | 14 | fourteen |
| 5 | five | 15 | fifteen |
| 6 | six | 16 | sixteen |
| 7 | seven | 17 | seventeen |
| 8 | eight | 18 | eighteen |
| 9 | nine | 19 | nineteen |
| 10 | ten | 20 | twenty |
Number Names (Tens - 20 to 100):
| Number | Number Name | Number | Number Name |
|---|---|---|---|
| 20 | twenty | 60 | sixty |
| 30 | thirty | 70 | seventy |
| 40 | forty | 80 | eighty |
| 50 | fifty | 90 | ninety |
| 100 | one hundred |
How to Read Two-Digit Numbers (21 to 99):
Say the tens name first, then the ones name. Examples:
- 21 = twenty-one
- 35 = thirty-five
- 48 = forty-eight
- 99 = ninety-nine
What is the number name for 37?
- The number 37 has 3 tens and 7 ones
- 3 tens = thirty
- 7 ones = seven
- Put them together: thirty-seven
-
Answer: thirty-seven **Example 2:** Write the number for "forty-five". *Solution:* - "forty" means 4 tens = 40 - "five" means 5 ones = 5 - Put them together: 40 + 5 = 45 - **Answer:** 45 **Example 3:** Write the number name for 100. *Solution:* - 100 has 1 hundred and 0 tens and 0 ones - The number name is "one hundred" - **Answer:** one hundred
Key Points
- Numbers 1 to 9 are one-digit numbers
- Numbers 10 to 99 are two-digit numbers
- 100 is the first three-digit number
- Number names for tens: twenty, thirty, forty, fifty, sixty, seventy, eighty, ninety
- For numbers 21-99, say the tens name first, then the ones name with a hyphen
Matching Numbers with Objects and Sequencing
What is Matching Numbers with Objects?
Matching means counting objects and finding the number that tells "how many". When you see 5 apples, the matching number is 5.
How to Count Objects:
1. Point to each object one by one
2. Say the number out loud as you point
3. The last number you say tells how many objects there are
What is Sequencing Numbers?
Sequencing means putting numbers in the correct order from smallest to largest (ascending) or largest to smallest (descending).
Ascending order (going up): 1, 2, 3, 4, 5, ...
Descending order (going down): 10, 9, 8, 7, 6, ...
What are Missing Numbers?
Sometimes a number is missing from a sequence. We need to find what number should be there by looking at the pattern.
Number Patterns:
- Counting by 1s: 5, 6, 7, 8, 9, ...
- Counting by 2s: 2, 4, 6, 8, 10, ...
- Counting by 5s: 5, 10, 15, 20, 25, ...
- Counting by 10s: 10, 20, 30, 40, 50, ...
Count the stars and write the number: ★ ★ ★ ★ ★
- Point to each star: 1, 2, 3, 4, 5
- There are 5 stars
-
Answer: 5 **Example 2:** Fill in the missing number: 23, 24, ___, 26, 27 *Solution:* - Numbers are increasing by 1 each time - After 24 comes 25 - Then 26, 27 confirm the pattern - **Answer:** 25 **Example 3:** Arrange these numbers in ascending order: 34, 29, 31, 28, 30 *Solution:* - Find the smallest number: 28 - Next smallest: 29 - Next: 30 - Next: 31 - Largest: 34 - Ascending order: 28, 29, 30, 31, 34 - **Answer:** 28, 29, 30, 31, 34
Key Points
- Counting tells how many objects there are
- The last number you say is the total count
- Sequencing is putting numbers in order
- Ascending = small to big; Descending = big to small
- Missing numbers can be found by looking at the pattern
Before, After, and Between Numbers
What are Before, After, and Between Numbers?
These words tell us about the position of a number compared to other numbers on the number line.
Before:
The number that comes just before a given number (one less).
Example: The number before 8 is 7.
After:
The number that comes just after a given number (one more).
Example: The number after 8 is 9.
Between:
The number that lies between two given numbers.
Example: The number between 8 and 10 is 9.
Using a Number Line:
```ascii
←──┼──┼──┼──┼──┼──┼──┼──┼──┼──┼──→
4 5 6 7 8 9 10 11 12 13
Before 7? → 6
After 7? → 8
Between 7 and 9? → 8
```
Tip: To find the number between two numbers, add them and divide by 2.
For example, between 10 and 12: (10 + 12) ÷ 2 = 22 ÷ 2 = 11
What number comes before 36?
- Before means one less
- 36 - 1 = 35
-
Answer: 35 **Example 2:** What number comes after 78? *Solution:* - After means one more - 78 + 1 = 79 - **Answer:** 79 **Example 3:** What number comes between 45 and 47? *Solution:* - Between means in the middle - (45 + 47) ÷ 2 = 92 ÷ 2 = 46 - Check: 45, 46, 47 ✓ - **Answer:** 46
Key Points
- Before = 1 less than the number (subtract 1)
- After = 1 more than the number (add 1)
- Between = the number that comes in the middle of two numbers
- Use a number line to see before, after, and between
- For consecutive numbers like 24 and 26, the between number is 25