Numbers 51 to 100
Now we learn the bigger two-digit numbers: 51 to 100. These numbers have tens digits from 5 to 10.
The number 100 is special — it is the first three-digit number and means 10 tens.
What is Numbers 51 to 100 - Class 1 Maths (Numbers up to 100)?
Numbers from 51 to 100 continue the counting pattern. Here is a number chart:
| 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 |
|---|---|---|---|---|---|---|---|---|---|
| 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 |
| 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 |
| 81 | 82 | 83 | 84 | 85 | 86 | 87 | 88 | 89 | 90 |
| 91 | 92 | 93 | 94 | 95 | 96 | 97 | 98 | 99 | 100 |
Solved Examples
Example 1: Tens and Ones in 73
Question: How many tens and ones in 73?
Think:
- Tens digit = 7 → 7 tens
- Ones digit = 3 → 3 ones
Answer: 73 = 7 tens and 3 ones.
Example 2: What Comes After 99?
Question: What number comes after 99?
Think:
- 99 + 1 = 100
- 100 is the first three-digit number
Answer: 100 comes after 99.
Example 3: Count from 55 to 65
Question: Count forward from 55 to 65.
Think:
- Start at 55 and add 1 each time
55 — 56 — 57 — 58 — 59 — 60 — 61 — 62 — 63 — 64 — 65
Answer: The numbers are listed above.
Example 4: Number Before 80
Question: What number comes just before 80?
Think:
- 80 − 1 = 79
Answer: 79 comes just before 80.
Example 5: Aman's Cricket Runs
Question: Aman scored 86 runs in a cricket match. How many tens and ones?
Think:
- 86 → tens digit = 8, ones digit = 6
- 8 tens and 6 ones
Answer: 86 = 8 tens and 6 ones.
Example 6: What is 100?
Question: How many tens make 100?
Think:
- Count by tens: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100
- That is 10 groups of ten
Answer: 10 tens make 100.
Example 7: Fill the Gap
Question: 67, 68, ___, 70, 71.
Think:
- After 68 comes 69
Answer: The missing number is 69.
Key Points to Remember
- Numbers 51 to 100 are two-digit numbers (except 100, which has three digits).
- The pattern repeats: ones go 1, 2, 3, ... 9, 0 and tens go up by 1.
- 99 is the largest two-digit number.
- 100 = 10 tens = the first three-digit number.
- Use a number chart (1 to 100) to see all the numbers at once.
Practice Problems
- Count from 78 to 88. Write all the numbers.
- How many tens and ones in 64?
- What number comes after 89?
- What is the biggest two-digit number?
- Fill in: 95, 96, ___, ___, 99.
- How many tens make 100?
Frequently Asked Questions
Q1. What is the largest two-digit number?
99 is the largest two-digit number. It has 9 tens and 9 ones.
Q2. What comes after 99?
100 comes after 99. It is the first three-digit number and equals 10 tens.
Q3. How do I count from 59 to 61?
59, 60, 61. When the ones digit reaches 9, the next number has 0 ones and one more ten.
Q4. How many tens are in 90?
90 has 9 tens and 0 ones.
Q5. What is 100 made of?
100 is made of 10 tens (or 100 ones). It is written with 3 digits: 1, 0, 0.
Q6. Why is learning up to 100 important?
Numbers up to 100 are used everywhere — in counting money (₹), telling pages in a book, and reading the score in cricket. It is the base for learning bigger numbers.
