Class 1
Class 2
CBSE
UP Board
📘 What’s inside:
Concept 1 — Number Before
The number that comes just before a given number is always 1 less than that number. On a number line, it sits immediately to the left.
▶ Rule
- Before any number N → answer = N − 1
- Example: before 9 → 9 − 1 = 8
- Example: before 100 → 100 − 1 = 99
- The number before 1 is 0. There is no number before 0.
Before (answer)
Given number
5
6Before 7
7Given
8
9
10
Number before 7 is 6
▶ Solved Example 1
Write the number that comes just before: (a) 15 (b) 40 (c) 100
- aBefore 15 → 15 − 1 = 14
- bBefore 40 → 40 − 1 = 39
- cBefore 100 → 100 − 1 = 99
(a) 14 | (b) 39 | (c) 99
▶ Solved Example 2
Sana has 51 stickers. Her friend has the number of stickers that comes just before 51. How many does her friend have?
- 1Number just before 51 = 51 − 1 = 50.
Sana’s friend has 50 stickers.
✍ Practice — Concept 1
Q1
Write the number just before: 8, 20, 55, 99.
▼
Answer
Before 8 → 7 | Before 20 → 19 | Before 55 → 54 | Before 99 → 98
Q2
True or False: The number before 10 is 11.
▼
Answer
False. The number before 10 is 9 (10 − 1 = 9). 11 comes after 10.
Q3
What number comes just before 1?
▼
Answer
The number before 1 is 0. Zero comes just before one.
Concept 2 — Number After
The number that comes just after a given number is always 1 more than that number. On a number line, it sits immediately to the right.
▶ Rule
- After any number N → answer = N + 1
- Example: after 9 → 9 + 1 = 10
- Example: after 99 → 99 + 1 = 100
- Numbers never end — there is always a number after any number.
Given number
After (answer)
12
13
14Given
15After 14
16
17
Number after 14 is 15
▶ Solved Example 3
Write the number that comes just after: (a) 27 (b) 79 (c) 199
- aAfter 27 → 27 + 1 = 28
- bAfter 79 → 79 + 1 = 80
- cAfter 199 → 199 + 1 = 200
(a) 28 | (b) 80 | (c) 200
⚠ Watch Out
After 9 comes 10 (not 90). After 19 comes 20 (not 110). When ones digit reaches 9, the tens digit increases by 1 and ones becomes 0.
✍ Practice — Concept 2
Q4
Write the number just after: 9, 19, 49, 99.
▼
Answer
After 9 → 10 | After 19 → 20 | After 49 → 50 | After 99 → 100
Q5
A bus has 35 seats. The next bus has the number of seats that comes just after 35. How many seats does the next bus have?
▼
Answer
After 35 = 35 + 1 = 36 seats.
Q6
Fill in the blanks: __ comes after 500. __ comes after 999.
▼
Answer
After 500 → 501 | After 999 → 1,000
» Master
Ascending and Descending Order
and practice with the
Free Worksheet.
Then level up with
Roman Numerals (I to C)
and try the
accompanying worksheet
to boost your skills.
Concept 3 — Number Between
The number that sits between two consecutive numbers is the one that comes after the smaller and before the larger. It is 1 more than the left number and 1 less than the right number.
▶ Rule
- Between N and N+2 → answer = N + 1
- Example: between 8 and 10 → 9
- Example: between 49 and 51 → 50
- Check: the answer must be 1 more than the left number AND 1 less than the right number.
Given numbers
Between (answer)
18
19
20Left
21Between
22Right
23
Number between 20 and 22 is 21
How to think about it:
8
Left
9
Between
10
Right
▶ Solved Example 4
Write the number between: (a) 35 and 37 (b) 99 and 101 (c) 199 and 201
- a35 + 1 = 36. Check: 36 − 1 = 35 ✓ 36 + 1 = 37 ✓ → 36
- b99 + 1 = 100. Check: 100 − 1 = 99 ✓ 100 + 1 = 101 ✓ → 100
- c199 + 1 = 200 → 200
(a) 36 | (b) 100 | (c) 200
▶ Solved Example 5
Rohan is standing between house number 72 and house number 74 on a street. What is his house number?
- 1Number between 72 and 74 = 72 + 1 = 73.
- 2Check: 73 − 1 = 72 ✓ 73 + 1 = 74 ✓
Rohan’s house number is 73.
✍ Practice — Concept 3
Q7
Write the number between: 24 and 26 | 59 and 61 | 149 and 151.
▼
Answer
24 and 26 → 25 | 59 and 61 → 60 | 149 and 151 → 150
Q8
Priya says the number between 30 and 32 is 33. Is she correct?
▼
Answer
No. 33 comes after 32, not between 30 and 32.
The number between 30 and 32 is 31 (30 + 1 = 31).
The number between 30 and 32 is 31 (30 + 1 = 31).
Concept 4 — Before, After & Between Together
Every number has a neighbour on each side. Understanding all three at once is essential for reading number sequences and placing numbers correctly.
▶ Summary of All Three
- Before N → N − 1 (one step left)
- After N → N + 1 (one step right)
- Between N and N+2 → N + 1 (sits in the middle)
Before
Given
After
43
44Before 45
45Given
46After 45
47
Before 45 = 44 After 45 = 46
▶ Solved Example 6
For the number 78, write the number just before, just after, and the numbers between 77 and 79.
- 1Before 78 = 78 − 1 = 77
- 2After 78 = 78 + 1 = 79
- 3Between 77 and 79 = 77 + 1 = 78 (same number we started with!)
Before: 77 | After: 79 | Between 77 and 79: 78
▶ Solved Example 7
Fill in the blanks: __ , 50 , __
49
Before 50
50
Given
51
After 50
49 , 50 , 51
✍ Practice — Concept 4
Q9
Fill in the blanks: __ , 30 , __ __ , 99 , __ __ , 200 , __
▼
Answer
29 , 30 , 31 | 98 , 99 , 100 | 199 , 200 , 201
Q10
Write before, between and after for: (a) 74 (b) 100 (c) 499
▼
Answer
(a) Before 73 , 74 , After 75 | Between 73 and 75: 74
(b) Before 99 , 100 , After 101 | Between 99 and 101: 100
(c) Before 498 , 499 , After 500 | Between 498 and 500: 499
(b) Before 99 , 100 , After 101 | Between 99 and 101: 100
(c) Before 498 , 499 , After 500 | Between 498 and 500: 499
Q11
A number is 1 more than 349 and 1 less than 351. What is the number?
▼
Answer
1 more than 349 = 350. 1 less than 351 = 350.
The number is 350. It is between 349 and 351.
The number is 350. It is between 349 and 351.
» Build your English grammar foundation with
Pronouns – Types & Usage
and reinforce with the
Free Worksheet.
Next, dive into
Verbs – Definition & Types
and practice using the
accompanying worksheet.
» हिंदी व्याकरण में संज्ञा के वचन – परिभाषा और भेद पढ़ें और अभ्यास वर्कशीट से अभ्यास करें, साथ ही संज्ञा के कारक – परिभाषा और प्रकार को समझें और वर्कशीट से अभ्यास करें।
» हिंदी व्याकरण में संज्ञा के वचन – परिभाषा और भेद पढ़ें और अभ्यास वर्कशीट से अभ्यास करें, साथ ही संज्ञा के कारक – परिभाषा और प्रकार को समझें और वर्कशीट से अभ्यास करें।
Concept 5 — Missing Numbers in a Sequence
A sequence is a list of numbers in order. When one or more numbers are missing, we use the before and after rule to find them.
▶ How to Find a Missing Number
- Look at the numbers on both sides of the blank.
- If they differ by 2 → the missing number is exactly in between.
- If the blank is at the start → use the “before” rule on the first given number.
- If the blank is at the end → use the “after” rule on the last given number.
▶ Solved Example 8
Find the missing numbers: __ , 17 , 18 , __ , 20
?Before 17
17
18
?Between 18&20
20
- 1First blank is before 17 → 17 − 1 = 16.
- 2Second blank is between 18 and 20 → 18 + 1 = 19.
16 , 17 , 18 , 19 , 20
▶ Solved Example 9
Find the missing numbers: 97 , __ , 99 , __ , 101
97
?
99
?
101
- 1Between 97 and 99 → 97 + 1 = 98.
- 2Between 99 and 101 → 99 + 1 = 100.
97 , 98 , 99 , 100 , 101
✍ Practice — Concept 5
Q12
Fill in the missing numbers: __ , 45 , 46 , __ , 48
▼
Answer
Before 45 = 44. Between 46 and 48 = 47.
44 , 45 , 46 , 47 , 48
44 , 45 , 46 , 47 , 48
Q13
Fill in the missing numbers: 198 , __ , 200 , __ , 202
▼
Answer
Between 198 and 200 = 199. Between 200 and 202 = 201.
198 , 199 , 200 , 201 , 202
198 , 199 , 200 , 201 , 202
Q14
A sequence reads: __ , __ , 10 , 11 , __. Fill all three blanks.
▼
Answer
Before 10 by 2 steps: 10−2=8, 10−1=9. After 11: 12.
8 , 9 , 10 , 11 , 12
8 , 9 , 10 , 11 , 12
★ Quick Revision — Key Points
- Before N = N − 1 | one step to the left on a number line.
- After N = N + 1 | one step to the right on a number line.
- Between N and N+2 = N + 1 | always the middle number.
- Before 1 is 0. There is no number before 0.
- After 9 is 10, after 19 is 20, after 99 is 100 — the tens digit increases.
- For missing numbers: check both neighbours and apply before/after/between rules.
▶ Exam Style Questions
Test Yourself
Q1
Write the number just before and just after: (a) 36 (b) 90 (c) 299
▼
Answer
(a) Before 35 , 36 , After 37
(b) Before 89 , 90 , After 91
(c) Before 298 , 299 , After 300
(b) Before 89 , 90 , After 91
(c) Before 298 , 299 , After 300
Q2
Write the number between: (a) 66 and 68 (b) 119 and 121 (c) 499 and 501
▼
Answer
(a) 67 | (b) 120 | (c) 500
Q3
Fill in all blanks: __ , 48 , __ , 50 , __ , 52 , __
▼
Answer
47 , 48 , 49 , 50 , 51 , 52 , 53
Q4
Meena says “the number before 40 is 39 and the number after 40 is 41, so the number between 39 and 41 must be 42.” Is she right? Explain.
▼
Answer
No. Meena’s first two facts are correct (before 40 = 39, after 40 = 41), but the number between 39 and 41 is 40, not 42. Between means one step after the left number: 39 + 1 = 40.
Q5
A number is between 99 and 101. It is also 1 more than 99 and 1 less than 101. Write the number in figures and in words.
▼
Answer
Between 99 and 101 = 99 + 1 = 100.
In words: one hundred.
In words: one hundred.
Q6
Fill in the missing numbers and identify the rule used for each blank:
__ , 25 , __ , 27 , __ , 29 ▼
__ , 25 , __ , 27 , __ , 29 ▼
Answer
First blank: 24 (before 25 → 25 − 1)
Second blank: 26 (between 25 and 27 → 25 + 1)
Third blank: 28 (between 27 and 29 → 27 + 1)
Full sequence: 24 , 25 , 26 , 27 , 28 , 29
Second blank: 26 (between 25 and 27 → 25 + 1)
Third blank: 28 (between 27 and 29 → 27 + 1)
Full sequence: 24 , 25 , 26 , 27 , 28 , 29
📄 Free Worksheet
Practise before, after and between with our free printable worksheet — fill in the blanks, missing sequences, and real-life word problems. No login required.
► Open Free Worksheet
