Let’s solve each number sequence one by one.
---
a) 0, 3, 6, 9, 12, ___
This is increasing by 3 each time:
0 + 3 = 3
3 + 3 = 6
6 + 3 = 9
9 + 3 = 12
12 + 3 =
15
→ Missing number:
15
---
b) 24, 26, ___, ___, 32, 34
This is increasing by 2 each time:
24 + 2 = 26
26 + 2 =
28
28 + 2 =
30
30 + 2 = 32
32 + 2 = 34
→ Missing numbers:
28, 30
---
c) 15, 13, 11, 9, 7, ___
This is decreasing by 2 each time:
15 - 2 = 13
13 - 2 = 11
11 - 2 = 9
9 - 2 = 7
7 - 2 =
5
→ Missing number:
5
---
d) 45, 55, 65, 75, ___, ___
This is increasing by 10 each time:
45 + 10 = 55
55 + 10 = 65
65 + 10 = 75
75 + 10 =
85
85 + 10 =
95
→ Missing numbers:
85, 95
---
e) ___, 50, 48, 46, ___, 42
This is decreasing by 2 each time. Let’s work backwards from 50:
50 - 2 = 48 → so before 50 should be 50 + 2 =
52
Then: 46 - 2 =
44
Check: 44 - 2 = 42 ✓
→ Missing numbers:
52, 44
---
f) 35, ___, 45, ___, 55, 60
Looks like increasing by 5 each time:
35 + 5 =
40
40 + 5 = 45
45 + 5 =
50
50 + 5 = 55
55 + 5 = 60 ✓
→ Missing numbers:
40, 50
---
g) 65, 68, 71, ___, 77, ___
Increasing by 3 each time:
65 + 3 = 68
68 + 3 = 71
71 + 3 =
74
74 + 3 = 77
77 + 3 =
80
→ Missing numbers:
74, 80
---
h) 73, 70, ___, ___, 61, 58
Decreasing by 3 each time:
73 - 3 = 70
70 - 3 =
67
67 - 3 =
64
64 - 3 = 61
61 - 3 = 58 ✓
→ Missing numbers:
67, 64
---
i) 89, 79, 69, ___, ___, ___
Decreasing by 10 each time:
89 - 10 = 79
79 - 10 = 69
69 - 10 =
59
59 - 10 =
49
49 - 10 =
39
→ Missing numbers:
59, 49, 39
---
j) 75, ___, ___, ___, 55, 50
Looks like decreasing by 5 each time:
75 - 5 =
70
70 - 5 =
65
65 - 5 =
60
60 - 5 = 55
55 - 5 = 50 ✓
→ Missing numbers:
70, 65, 60
---
Final Answer:
a) 15
b) 28, 30
c) 5
d) 85, 95
e) 52, 44
f) 40, 50
g) 74, 80
h) 67, 64
i) 59, 49, 39
j) 70, 65, 60
Parent Tip: Review the logic above to help your child master the concept of pattern sequence worksheet ks1.
