Halloween Missing Numbers Worksheet: Numbers 1 to 20 - Tims ... - Free Printable

Let's solve the problem step by step.

We are given a grid of pumpkins arranged in 5 rows and 4 columns. Each pumpkin has a number, but some are missing. The task is to write the missing numbers in the correct positions.

Here’s the grid as it appears:

```
Row 1: [ ] 2 [ ] 4
Row 2: 5 [ ] 7 [ ]
Row 3: 9 [ ] 11 [ ]
Row 4: 13 [ ] 15 [ ]
Row 5: 17 [ ] 19 [ ]
```

Step 1: Look for a pattern

Let’s examine the numbers that are already filled in:

- Row 1: 2, 4
- Row 2: 5, 7
- Row 3: 9, 11
- Row 4: 13, 15
- Row 5: 17, 19

Notice:
- The numbers are increasing.
- The odd-numbered columns (1st and 3rd) have odd numbers.
- The even-numbered columns (2nd and 4th) have even numbers.

But let’s look at the positions:

Let’s list all the known numbers with their positions:

| Row | Col | Number |
|-----|-----|--------|
| 1 | 2 | 2 |
| 1 | 4 | 4 |
| 2 | 1 | 5 |
| 2 | 3 | 7 |
| 3 | 1 | 9 |
| 3 | 3 | 11 |
| 4 | 1 | 13 |
| 4 | 3 | 15 |
| 5 | 1 | 17 |
| 5 | 3 | 19 |

Now observe:
- Column 1: 5, 9, 13, 17 → increasing by 4 each time?
5 → 9 (+4), 9 → 13 (+4), 13 → 17 (+4) → yes!
- Column 3: 7, 11, 15, 19 → also +4 each time: 7→11→15→19

So:
- Column 1: 5, 9, 13, 17 — so what about Row 1, Col 1? That should be before 5.
Since we're adding 4 each time, go backwards:
5 - 4 = 1

- So Row 1, Col 1 = 1

Now check Column 3:
- We have 7, 11, 15, 19 → so Row 1, Col 3 should be before 7 → 7 - 4 = 3

So:
- Row 1, Col 3 = 3

Now look at Column 2 (even column):
- We have Row 1: 2, Row 2: ?, Row 3: ?, Row 4: ?, Row 5: ?

Similarly, Column 4:
- Row 1: 4, Row 2: ?, Row 3: ?, Row 4: ?, Row 5: ?

Let’s see if there’s a pattern.

Look at Column 2:
- Row 1: 2
- Row 2: ?
- Row 3: ?
- Row 4: ?
- Row 5: ?

And Column 4:
- Row 1: 4
- Row 2: ?
- Row 3: ?
- Row 4: ?
- Row 5: ?

Now notice:
- Column 1: 1, 5, 9, 13, 17 → increases by 4
- Column 3: 3, 7, 11, 15, 19 → increases by 4

So maybe the entire grid is counting up by 1, but only showing certain numbers?

Wait — let’s try to reconstruct the full sequence.

Suppose the grid is just listing consecutive numbers from 1 to 20, placed in order.

Let’s test that idea.

Assume the numbers go from 1 to 20, row by row, left to right.

Then the grid would be:

```
Row 1: 1 2 3 4
Row 2: 5 6 7 8
Row 3: 9 10 11 12
Row 4: 13 14 15 16
Row 5: 17 18 19 20
```

Now compare this with what we have:

Given:
```
Row 1: [ ] 2 [ ] 4
Row 2: 5 [ ] 7 [ ]
Row 3: 9 [ ] 11 [ ]
Row 4: 13 [ ] 15 [ ]
Row 5: 17 [ ] 19 [ ]
```

Now fill in the blanks using the full sequence:

- Row 1: 1, 2, 3, 4 → missing 1 and 3
- Row 2: 5, 6, 7, 8 → missing 6 and 8
- Row 3: 9, 10, 11, 12 → missing 10 and 12
- Row 4: 13, 14, 15, 16 → missing 14 and 16
- Row 5: 17, 18, 19, 20 → missing 18 and 20

So the missing numbers are:

- Row 1: 1 (Col 1), 3 (Col 3)
- Row 2: 6 (Col 2), 8 (Col 4)
- Row 3: 10 (Col 2), 12 (Col 4)
- Row 4: 14 (Col 2), 16 (Col 4)
- Row 5: 18 (Col 2), 20 (Col 4)

Thus, the completed grid is:

```
Row 1: 1 2 3 4
Row 2: 5 6 7 8
Row 3: 9 10 11 12
Row 4: 13 14 15 16
Row 5: 17 18 19 20
```

Final Answer:

The missing numbers are:

- Row 1: 1, 3
- Row 2: 6, 8
- Row 3: 10, 12
- Row 4: 14, 16
- Row 5: 18, 20

So, write these numbers in the blank pumpkins accordingly.

✔ Solution: Fill the grid with consecutive numbers from 1 to 20 in order. The missing numbers are:
1, 3, 6, 8, 10, 12, 14, 16, 18, 20.