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30 Solved + 20 Practice
GuidedPath Noida · Primary Maths · Worksheet
Finding Missing Numbers on a Number Line
Find the missing number(s) on a number line by reading the skip rule — by 1s, 2s, 5s and 10s, forward and backward. Fully interactive Input Checker: type your answer and press Check, or tap Reveal. 30 solved + 20 practice questions.
📋 Worksheet Contents:
📌 Solved questions show the complete number line with the missing value revealed and highlighted. In Practice, type your answer in the box and press Check — correct answers light up green instantly!
Solved Questions — Starter
Q1 to Q10 · Single missing number · By 1s, 2s, 5s · Forward only
Q1
Find the missing number: 0, 1, 2, __, 4, 5 on a number line. Starter
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Solution
by 1s — add 1 each time
1
The rule is +1. After 2, the next number = 2+1 = 3.
✓ Missing number = 3
Q2
Find the missing number: 2, 4, __, 8, 10 on a number line. Starter
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Solution
by 2s — add 2 each time
1
Rule = +2. After 4: 4+2 = 6. Check: 6+2=8 ✓
✓ Missing number = 6
Q3
Find the missing number: 0, 5, 10, __, 20 on a number line. Starter
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Solution
by 5s — add 5 each time
1
Rule = +5. After 10: 10+5 = 15. Check: 15+5=20 ✓
✓ Missing number = 15
Q4
Find the missing number: 3, 4, 5, 6, __, 8 on a number line. Starter
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Solution
by 1s
1
Rule = +1. After 6: 6+1 = 7.
✓ Missing number = 7
Q5
Find the missing number: 6, 8, 10, __, 14 on a number line. Starter
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Solution
by 2s
1
Rule = +2. After 10: 10+2 = 12. Check: 12+2=14 ✓
✓ Missing number = 12
Q6
Find the missing number: 10, 15, __, 25, 30 on a number line. Starter
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Solution
by 5s
1
Rule = +5. After 15: 15+5 = 20.
✓ Missing number = 20
Q7
Find the missing number: 0, 1, __, 3, 4 on a number line. Starter
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Solution
by 1s
1
Rule = +1. After 1: 1+1 = 2.
✓ Missing number = 2
Q8
Find the missing number: 4, 6, 8, 10, __, 14 on a number line. Starter
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Solution
by 2s
1
Rule = +2. After 10: 10+2 = 12.
✓ Missing number = 12
Q9
Find the missing number: 5, 10, 15, 20, 25, __ on a number line. Starter
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Solution
by 5s
1
Rule = +5. After 25: 25+5 = 30.
✓ Missing number = 30
Q10
A number line shows: 7, 8, __, 10, 11. What is the missing number? Starter
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Solution
by 1s
1
Rule = +1. After 8: 8+1 = 9.
✓ Missing number = 9
Solved Questions — Core Practice
Q11 to Q22 · By 10s · Backward sequences · Multiple gaps · Identify the rule
Q11
Find the missing number: 0, 10, 20, __, 40, 50 on a number line. Core
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Solution
by 10s — add 10 each time
1
Rule = +10. After 20: 20+10 = 30.
✓ Missing number = 30
Q12
Find the missing number going backward: 10, 9, 8, __, 6 on a number line. Core
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Solution
by 1s backward — subtract 1
1
Rule = −1. After 8: 8−1 = 7.
✓ Missing number = 7
Q13
Find the missing number going backward: 20, 18, 16, __, 12 on a number line. Core
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Solution
by 2s backward — subtract 2
1
Rule = −2. After 16: 16−2 = 14. Check: 14−2=12 ✓
✓ Missing number = 14
Q14
Find the missing number going backward: 50, 40, 30, __, 10 on a by-10s number line. Core
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Solution
by 10s backward — subtract 10
1
Rule = −10. After 30: 30−10 = 20.
✓ Missing number = 20
Q15
Find both missing numbers: 0, 2, __, 6, __, 10 on a number line. Core
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Solution
by 2s
1
Rule = +2. After 2: 2+2 = 4. After 6: 6+2 = 8.
✓ Missing numbers = 4 and 8
Q16
Find both missing numbers: 0, __, 10, 15, __, 25 on a number line. Core
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Solution
by 5s
1
Rule = +5. After 0: 0+5 = 5. After 15: 15+5 = 20.
✓ Missing numbers = 5 and 20
Q17
A number line shows: 3, __, 9, 12, 15. What is the rule? What is the missing number? Core
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Solution
1
From 9 to 12 = +3. From 12 to 15 = +3. Rule = +3.
2
After 3: 3+3 = 6. Check: 6+3=9 ✓
✓ Rule = by 3s | Missing = 6
Q18
A number line going backward shows: 25, __, 15, 10, 5. What is the rule? What is the missing number? Core
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Solution
1
From 15 to 10 = −5. From 10 to 5 = −5. Rule = −5.
2
After 25: 25−5 = 20. Check: 20−5=15 ✓
✓ Rule = by 5s backward | Missing = 20
Q19
A frog skips every 2 steps. It lands on 4, 6, 8, then misses a spot, then lands on 12. What spot did it miss? Core
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Solution
1
Rule = +2. After 8: 8+2 = 10. Check: 10+2=12 ✓
✓ The missed spot = 10
Q20
Find both missing numbers: 10, 20, __, 40, __, 60 on a by-10s number line. Core
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Solution
by 10s
1
Rule = +10. After 20: 30. After 40: 50.
✓ Missing numbers = 30 and 50
Q21
Find the missing number: 80, 70, 60, __, 40 on a by-10s backward number line. Core
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Solution
by 10s backward
1
Rule = −10. After 60: 60−10 = 50.
✓ Missing number = 50
Q22
Children count by 5s on a number line: 5, 10, __, 20, 25. Which number is missing? Which child should say it? (They take turns.) Core
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Solution
1
Rule = +5. After 10: 10+5 = 15.
2
5 = child 1, 10 = child 2, 15 = child 3, 20 = child 4, 25 = child 5. The 3rd child says 15.
✓ Missing = 15. The 3rd child says it.
Solved Questions — Challenge
Q23 to Q30 · Multiple blanks · Unknown rule · HOTs
Q23
A number line has: __, 6, 9, 12, 15. What is the rule? What is the first number? Challenge
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Solution
1
From 6 to 9 = +3. Rule = +3.
2
Before 6: 6−3 = 3.
✓ Rule = by 3s | First number = 3
Q24
Backward number line: __, 16, 14, 12, 10. What is the rule? What is the first (largest) number? Challenge
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Solution
1
From 16 to 14 = −2. Rule = −2.
2
Before 16 (going backward means the first number is larger): 16+2 = 18.
✓ Rule = by 2s backward | First number = 18
Q25
Find all three missing numbers: 0, __, 20, __, 40, __ on a by-10s number line. Challenge
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Solution
by 10s
1
After 0: 10. After 20: 30. After 40: 50.
✓ Missing numbers = 10, 30, 50
Q26
A number line shows only: 4, __, __, __, 20. The rule is the same gap each time. What is the rule? Fill the three blanks. Challenge
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Solution
1
Total distance = 20−4 = 16. 4 equal gaps → 16÷4 = 4 each. Rule = +4.
2
4, 4+4=8, 8+4=12, 12+4=16, 20.
✓ Rule = +4 | Blanks = 8, 12, 16
Q27
A number line shows: 100, 90, __, 70, 60. What is the rule and what is the missing number? Challenge
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Solution
1
100→90 = −10. Rule = −10. After 90: 90−10 = 80.
✓ Rule = by 10s backward | Missing = 80
Q28
Number line: __, 10, 12, 14, 16. What comes before 10 in this pattern? Challenge
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Solution
1
Rule = +2 (10→12→14→16). Before 10: 10−2 = 8.
✓ Missing = 8
Q29
Asha counts on a number line: 5, 10, 15, __, 25. She says the missing number is 18 because “it comes after 15.” Is she correct? What is the missing number? Challenge
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Solution
1
Rule = +5. After 15: 15+5 = 20. Check: 20+5=25 ✓
2
Asha is wrong. We must follow the rule, not just any number after 15.
✓ Asha is wrong. Missing = 20.
Q30
A number line goes: 50, 45, __, 35, __, 25. Find the rule and both missing numbers. Challenge
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Solution
1
50→45 = −5. Rule = −5.
2
After 45: 45−5 = 40. After 35: 35−5 = 30.
✓ Rule = by 5s backward | Missing = 40 and 30
Practice — Input Checker
P1 to P12 · Look at the number line — type the missing number and press Check!
Study the number line shown. Type the missing number in the box. Press Check — green means correct! Press Reveal if stuck.
P1
Find the missing number on this number line. by 1s
▼
Sequence: 1, 2, __, 4, 5
Missing number =
P2
Find the missing number. by 2s
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Sequence: 0, 2, 4, __, 8
Missing number =
P3
Find the missing number. by 5s
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Sequence: 5, 10, __, 20, 25
Missing number =
P4
Find the missing number. by 10s
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Sequence: 10, 20, 30, __, 50
Missing number =
P5
Backward number line — find the missing number. by 1s backward
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Sequence: 8, 7, __, 5, 4
Missing number =
P6
Backward number line — find the missing number. by 2s backward
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Sequence: 14, 12, 10, __, 6
Missing number =
P7
Backward number line — find the missing number. by 10s backward
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Sequence: 60, 50, __, 30, 20
Missing number =
P8
Find the rule, then find the missing number. find the rule!
▼
Sequence: 2, 4, 6, __, 10 — what is the rule? what is the missing number?
Missing number =
P9
Find the rule, then find the missing number. find the rule!
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Sequence: 0, __, 10, 15, 20
Missing number =
P10
The missing number comes before the first shown number! by 2s
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Sequence: __, 6, 8, 10, 12
Missing number =
P11
Find both missing numbers. by 10s
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Sequence: 0, __, 20, 30, __, 50
First blank =
Second blank =
P12
Identify the rule and find both missing numbers. Challenge
▼
Sequence: __, 10, 15, __, 25 — find the rule and fill both blanks.
First blank =
Second blank =
Practice — Match the Following
P13 to P16 · Match the number line sequence to its missing number
P13–14
Match each incomplete sequence to its missing number.
▼
0, 2, __, 6, 8
5, 10, __, 20
10, 20, __, 40
7, 8, __, 10
10, 8, __, 4
4
15
30
9
6
P15–16
Match each rule description to the correct missing number.
▼
By 2s — after 6
By 5s — after 20
By 10s — after 40
By 1s backward — before 6
By 10s backward — before 10
8
25
50
7
20
Practice — True or False
P17 to P20 · Tap TRUE or FALSE — instant feedback
P17 In the sequence 2, 4, __, 8, 10 on a number line, the missing number is 5.
TRUE
FALSE
P17b On a by-10s backward number line showing 50, 40, __, 20, the missing number is 30.
TRUE
FALSE
P18 The missing number in __, 10, 12, 14 (by 2s) is 9, because 9 comes just before 10.
TRUE
FALSE
P19 On a number line with rule +5, if the sequence is 15, 20, __, 30, the missing number is 25.
TRUE
FALSE
P20 In 0, __, 4, 6, 8 the missing number is 2, and the rule is counting by 2s.
TRUE
FALSE
P20b On a number line showing 90, 80, __, 60, 50, any number between 60 and 80 could be the missing value.
TRUE
FALSE
Answer Key
Interactive sections self-check — key covers solved highlights
🔑 Show Answer Key
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Solved Q1–10
Q1: 3 | Q2: 6 | Q3: 15 | Q4: 7 | Q5: 12 | Q6: 20 | Q7: 2 | Q8: 12 | Q9: 30 | Q10: 9
Core Q11–22Q11: 30 | Q12: 7 | Q13: 14 | Q14: 20 | Q15: 4, 8 | Q16: 5, 20
Q17: rule=+3, 6 | Q18: rule=−5, 20 | Q19: 10 | Q20: 30, 50 | Q21: 50 | Q22: 15 (3rd child)
Q23: rule=+3, first=3 | Q24: rule=−2, first=18 | Q25: 10, 30, 50
Q26: rule=+4, blanks=8, 12, 16 | Q27: 80 | Q28: 8 | Q29: Asha wrong, 20 | Q30: rule=−5, 40, 30
P1: 3 | P2: 6 | P3: 15 | P4: 40 | P5: 6 | P6: 8 | P7: 40 | P8: 8 (rule=+2) | P9: 5 (rule=+5) | P10: 4 | P11: 10, 40 | P12: 5, 20 (rule=+5)
True / False (P17–P20)P17: False | P17b: True | P18: False | P19: True | P20: True | P20b: False
