Students practice skip counting by 10s on a number line using a fun apple-themed worksheet.

Let's solve the problem step by step.

Task:

Skip counting by 10’s on a Number Line
We are given three number lines, each with missing numbers. We need to fill in the missing numbers by skip counting by 10s. Then, we are to cut and paste the correct numbers from the box at the bottom into the blank boxes (apples) on the number lines.

---

Step 1: Understand Skip Counting by 10s

When we skip count by 10s, we add 10 to the previous number:
- Example: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100...

So each number increases by 10.

---

Step 2: Analyze Each Number Line

#### First Number Line:
```
10 □ 30 40 □ 60 70 80 □
```

Let’s fill in the blanks:

- After 10 comes 20 → so first apple = 20
- After 40 comes 50 → second apple = 50
- After 80 comes 90 → third apple = 90

✔ So the missing numbers are: 20, 50, 90

---

#### Second Number Line:
```
100 110 □ 130 □ □ 160 170 □
```

Skip counting by 10s:

- 100, 110, 120, 130, 140, 150, 160, 170, 180

So the missing numbers are:
- After 110 → 120
- After 130 → 140
- After 140 → 150
- After 170 → 180

✔ Missing numbers: 120, 140, 150, 180

---

#### Third Number Line:
```
□ 200 210 220 □ 240 250 260 270
```

Let’s go step by step:

- Before 200: 190 (since 190 + 10 = 200)
- After 220: 230 (220 + 10 = 230)

So:
- First apple (before 200) = 190
- Second apple (after 220) = 230

✔ Missing numbers: 190, 230

---

Step 3: Collect All Missing Numbers

From all three lines, the missing numbers are:

- 20, 50, 90, 120, 140, 150, 180, 190, 230

Now, look at the box of numbers provided at the bottom:

> 20, 90, 120, 230, 150, 160, 50, 190, 180

Wait — this box has:
- 20 ✔
- 90 ✔
- 120 ✔
- 230 ✔
- 150 ✔
- 160 ✘ (not needed)
- 50 ✔
- 190 ✔
- 180 ✔

But we don’t need 160 — it's not missing in any of the number lines.

So the correct numbers to cut and paste are:
- 20, 50, 90, 120, 140, 150, 180, 190, 230

But wait — 140 is not in the box!

Let’s double-check.

The box says:
> 20, 90, 120, 230, 150, 160, 50, 190, 180

It does not include 140.

But we need 140 for the second number line!

Hmm — maybe there’s a mistake?

Wait — let's recheck the second number line:

```
100 110 □ 130 □ □ 160 170 □
```

Sequence:
100, 110, ?, 130, ?, ?, 160, 170, ?

So:
- 100 → 110 → 120 → 130 → 140 → 150 → 160 → 170 → 180

So missing: 120, 140, 150, 180

But 140 is not in the box.

But the box includes: 20, 90, 120, 230, 150, 160, 50, 190, 180

So 140 is missing from the box.

This suggests either:
- There's an error in the image or
- We made a mistake.

Wait — perhaps I misread the second number line.

Let me check again.

Is it possible that the second number line skips differently?

No — it goes:
100, 110, __, 130, __, __, 160, 170, __

That means:
- 100 → 110 → 120 → 130 → 140 → 150 → 160 → 170 → 180

Yes — so 140 is needed.

But it's not in the box.

Wait — maybe the box is meant to be used as a selection, and some numbers are repeated?

But 140 is not listed.

Alternatively, could there be a typo?

Wait — look at the box again:

> 20, 90, 120, 230, 150, 160, 50, 190, 180

All these numbers are in our list except 140.

But we need 140.

Wait — unless the second number line has a different pattern?

Let’s see:

Maybe the second line is:

100, 110, __, 130, __, __, 160, 170, __

So positions:
- 100
- 110
- ?
- 130
- ?
- ?
- 160
- 170
- ?

So:
- 100 → 110 → 120 → 130 → 140 → 150 → 160 → 170 → 180

Yes — 120, 140, 150, 180 are missing.

But only 120, 150, 180 are in the box.

140 is missing.

But the box has 160, which we don't need.

So either:
- The box is incorrect, or
- The number line is different.

Wait — maybe the apples are not all filled? Or perhaps the box is just a set of options, and some numbers are duplicates?

But 140 is not in the box.

Wait — maybe I made a mistake in the first line?

Let’s recheck all.

---

Recheck First Line:

```
10 □ 30 40 □ 60 70 80 □
```

- 10 → 20 → 30 → 40 → 50 → 60 → 70 → 80 → 90

So missing: 20, 50, 90 ✔

These are in the box.

---

Second Line:

```
100 110 □ 130 □ □ 160 170 □
```

- 100 → 110 → 120 → 130 → 140 → 150 → 160 → 170 → 180

So missing: 120, 140, 150, 180

Box has: 120, 150, 180 ✔ but no 140

But 140 is needed.

Unless... maybe the number line skips something?

Wait — what if the second number line is:

100, 110, __, 130, __, __, 160, 170, __

Is it possible that it's not strictly increasing by 10?

No — skip counting by 10s must be consistent.

Wait — maybe the box has a typo?

Look at the box:
> 20, 90, 120, 230, 150, 160, 50, 190, 180

Wait — 160 is in the box, but we don’t need it.

And 140 is missing.

But maybe the second number line doesn't have four blanks?

Let’s count the apples:

- First line: 3 apples
- Second line: 4 apples
- Third line: 2 apples

Total: 9 apples

Box has 9 numbers.

So probably, the 9 numbers in the box are the 9 missing numbers.

So let’s list all missing numbers:

1. First line: 20, 50, 90
2. Second line: 120, 140, 150, 180
3. Third line: 190, 230

Wait — that’s 3 + 4 + 2 = 9 numbers.

So missing:
20, 50, 90, 120, 140, 150, 180, 190, 230

But the box has:
20, 90, 120, 230, 150, 160, 50, 190, 180

Compare:

| Needed | In Box? |
|--------|--------|
| 20 | Yes |
| 50 | Yes |
| 90 | Yes |
| 120 | Yes |
| 140 | No |
| 150 | Yes |
| 180 | Yes |
| 190 | Yes |
| 230 | Yes |

So 140 is missing, but 160 is extra.

So likely, there is a typo in the box — 160 should be 140.

Because otherwise, the activity doesn’t work.

Perhaps the box was printed incorrectly.

But let’s assume the box is correct — then maybe the second number line is different?

Wait — maybe the second number line is:

100, 110, __, 130, __, __, 160, 170, __

But what if the sequence is not continuous?

Wait — no, skip counting by 10s implies regular intervals.

Alternatively, perhaps one of the numbers is duplicated?

But 140 is clearly needed.

Wait — maybe the box is scrambled, and we can use the numbers that are present.

But 140 is not there.

Unless — could the number line have a different value?

Wait — maybe I misread the second number line.

Let me write it again:

```
100 110 □ 130 □ □ 160 170 □
```

So positions:
- 100
- 110
- ?
- 130
- ?
- ?
- 160
- 170
- ?

So the numbers between 110 and 130 is 120.

Then 130 → 140 → 150 → 160

So yes: 120, 140, 150

Then after 170 is 180.

So missing: 120, 140, 150, 180

But 140 is not in the box.

However, the box has 160, which is already given.

So unless there’s a mistake, we must conclude that 140 should be in the box instead of 160.

Therefore, likely a typo in the worksheet.

But since the task is to solve it, and assuming the box is correct, then maybe the number line is different?

Wait — another idea: maybe the second number line is not starting from 100?

No — it starts at 100.

Or perhaps the apples are not all for missing numbers?

Wait — the instruction says: "Cut and past the correct number in each box."

There are 9 apples, and 9 numbers in the box.

So we must use all 9 numbers.

Let’s list the numbers in the box:
- 20
- 90
- 120
- 230
- 150
- 160
- 50
- 190
- 180

Now, let’s assign them to the number lines.

Assign to First Line:

Missing: 20, 50, 90 → all in box ✔

So place:
- 20 after 10
- 50 after 40
- 90 after 80

Assign to Third Line:

Missing: 190, 230 → both in box ✔

So:
- 190 before 200
- 230 after 220

Now Second Line:

Missing: 120, 140, 150, 180

Available from box: 120, 150, 180 → all present

But 140 is missing — but 160 is in the box.

So perhaps the second number line has a mistake?

Wait — maybe the number line is:

100, 110, __, 130, __, __, 160, 170, __

But what if the number after 130 is not 140?

No — skip counting by 10s: 130 → 140 → 150 → 160

So 140 is required.

But 140 is not in the box.

Unless — could 160 be used in the second line?

But 160 is already on the number line.

The number line shows: ..., 160, 170, ...

So 160 is already filled.

So we cannot use it.

Similarly, 180 is after 170.

So the missing numbers are 120, 140, 150, 180

But only 120, 150, 180 are in the box.

140 is missing.

So unless the box has a typo, we can’t complete the puzzle.

But since this is a worksheet, likely the intended answer is:

Final Answer:

Assuming the box is correct and there's a typo (140 should be 160), but 160 is already on the line, so maybe it's not needed.

Wait — perhaps the second number line is:

100, 110, __, 130, __, __, 160, 170, __

But if the number after 130 is 150? That would be skipping 140 — not allowed.

So it must be 140.

Therefore, the most likely explanation is that the box contains a typo: 160 should be 140.

So the correct box should be:

> 20, 90, 120, 230, 150, 140, 50, 190, 180

Then everything works.

But since we have to work with what’s given, perhaps the teacher expects us to use the numbers in the box.

But 140 is not there.

Alternatively, maybe the second number line is:

100, 110, __, 130, __, __, 160, 170, __

And the numbers are: 120, 140, 150, 180

But if 140 is not in the box, then it's impossible.

Wait — unless the box is not exclusive — but it says "cut and paste", so likely use the numbers provided.

But 140 is missing.

So perhaps the number line is different.

Wait — let’s look back at the image.

You said: "I uploaded an image with a task"

But I can't see the image.

So I'm relying on your description.

You wrote:

> Cut and past the correct number in each box.
>
> Number lines:
> - 10, _, 30, 40, _, 60, 70, 80, _
> - 100, 110, _, 130, _, _, 160, 170, _
> - _, 200, 210, 220, _, 240, 250, 260, 270
>
> Box: 20, 90, 120, 230, 150, 160, 50, 190, 180

So based on that, the only way this works is if the second number line does not require 140.

But it does.

Unless the sequence is not arithmetic.

But skip counting by 10s is arithmetic.

Another possibility: maybe the second number line has a different pattern.

For example, maybe it's not 100, 110, 120, 130, etc., but something else.

But that contradicts the instruction.

Given that, the only logical conclusion is that 140 is needed, but it's not in the box.

So perhaps the box has a typo, and 160 should be 140.

Because 160 is already on the number line.

So likely, the number 160 in the box is a mistake.

Therefore, we can assume that the correct number to use is 140, and the box should have 140 instead of 160.

Final Answer (with correction):

Use the numbers from the box, but replace 160 with 140.

Then the missing numbers are:

- First line: 20, 50, 90
- Second line: 120, 140, 150, 180
- Third line: 190, 230

And all are in the corrected box.

So the solution is:

#### First Number Line:
- After 10: 20
- After 40: 50
- After 80: 90

#### Second Number Line:
- After 110: 120
- After 130: 140
- After 140: 150
- After 170: 180

#### Third Number Line:
- Before 200: 190
- After 220: 230

✔ Final Answer:

Fill in the apples with:
- 20, 50, 90, 120, 140, 150, 180, 190, 230

(Note: The box should have 140 instead of 160.)

If you must use the given box, then 160 is not needed, and 140 is missing, so the worksheet has an error.

But for educational purposes, the correct values are as above.