Grade 1 Number Patterns Worksheet - Complete the sequences with missing numbers.

Let's solve each pattern step by step and explain the reasoning behind each one.

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1. [5] [6] [ ] [8] [9] [ ] [11] [ ]

Look at the sequence:
5, 6, _, 8, 9, _, 11, _

We see that numbers increase by 1:
- 5 → 6 → (7) → 8 → 9 → (10) → 11 → (12)

So the missing numbers are:
7, 10, 12

✔ Answer: 7, 10, 12

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2. [3] [6] [ ] [ ] [15] [18] [21] [ ]

Sequence: 3, 6, _, _, 15, 18, 21, _

This increases by 3 each time:
- 3 → 6 → 9 → 12 → 15 → 18 → 21 → 24

So missing numbers:
9, 12, 24

✔ Answer: 9, 12, 24

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3. [ ] [10] [15] [ ] [25] [ ] [35] [ ]

Sequence: _, 10, 15, _, 25, _, 35, _

Check the pattern:
- 10 to 15 = +5
- So likely increasing by 5 each time.

Then:
- Before 10: 10 - 5 = 5
- After 15: 15 + 5 = 20
- After 25: 25 + 5 = 30
- After 35: 35 + 5 = 40

Sequence: 5, 10, 15, 20, 25, 30, 35, 40

✔ Answer: 5, 20, 30, 40

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4. [ ] [ ] [6] [8] [ ] [12] [ ] [16]

Sequence: _, _, 6, 8, _, 12, _, 16

Looks like increasing by 2:
- 6 → 8 → 10 → 12 → 14 → 16

So fill in:
- Before 6: 4, then 2
- After 8: 10
- After 12: 14

Sequence: 2, 4, 6, 8, 10, 12, 14, 16

✔ Answer: 2, 4, 10, 14

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5. [37] [ ] [ ] [40] [ ] [42] [43] [ ]

Sequence: 37, _, _, 40, _, 42, 43, _

Look at known values:
- 37 → 40 → 42 → 43

From 37 to 40 is +3, so maybe adding 1 each time?

But let’s check gaps:

Try increasing by 1:
- 37 → 38 → 39 → 40 → 41 → 42 → 43 → 44

Yes! That fits perfectly.

So missing:
- After 37: 38, 39
- After 40: 41
- After 43: 44

✔ Answer: 38, 39, 41, 44

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6. [ ] [26] [25] [ ] [ ] [22] [21] [ ]

Sequence: _, 26, 25, _, _, 22, 21, _

Look at the numbers: decreasing?
- 26 → 25 → ? → ? → 22 → 21 → ?

So likely decreasing by 1.

But from 26 to 25 is –1, then next should be 24, 23, 22, 21, 20

So:
- Before 26: 27 (since it goes 27 → 26 → 25 → ...)
- Then: 24, 23
- After 21: 20

Sequence: 27, 26, 25, 24, 23, 22, 21, 20

✔ Answer: 27, 24, 23, 20

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7. [10] [12] [ ] [ ] [18] [ ] [22] [ ]

Sequence: 10, 12, _, _, 18, _, 22, _

Increasing?
10 → 12 = +2

Assume +2 each time:
- 10 → 12 → 14 → 16 → 18 → 20 → 22 → 24

So missing:
- After 12: 14, 16
- After 18: 20
- After 22: 24

✔ Answer: 14, 16, 20, 24

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8. [49] [ ] [47] [ ] [45] [ ] [43] [ ]

Sequence: 49, _, 47, _, 45, _, 43, _

Decreasing by 2 each time?

49 → 47 → 45 → 43 → ...

So:
- Between 49 and 47: 48
- Between 47 and 45: 46
- Between 45 and 43: 44
- After 43: 42

So pattern: 49, 48, 47, 46, 45, 44, 43, 42

✔ Answer: 48, 46, 44, 42

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✔ Final Answers:

1. 7, 10, 12
2. 9, 12, 24
3. 5, 20, 30, 40
4. 2, 4, 10, 14
5. 38, 39, 41, 44
6. 27, 24, 23, 20
7. 14, 16, 20, 24
8. 48, 46, 44, 42

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