Count by 10's worksheet with fill-in-the-blank number sequences for practicing skip counting.

Let's solve the problem step by step. The task is to count by 10s and fill in the missing numbers in each row.

---

1. Count by 10s: Fill in the missing numbers below.

We are counting forward by 10s.

#### 1.
`10, __, __, __, 40, __`

- Start at 10
- Add 10 each time:
- 10 → 20 → 30 → 40 → 50

So the sequence is:
10, 20, 30, 40, 50

✔ Answer: `10, 20, 30, 40, 50`

---

#### 2.
`__, 40, __, __, 70`

We know it's increasing by 10s.

- Before 40: 40 - 10 = 30
- After 40: 50
- Then 60
- Then 70

So:
30, 40, 50, 60, 70

✔ Answer: `30, 40, 50, 60, 70`

---

3. Backward skip counting.

Now we count backwards by 10s.

#### 3.
`__, __, 30, __, 10`

Counting backwards from 30:
- 30 → 20 → 10 (but we need two numbers before 30 and one after)

Wait — the pattern is:
__ , __ , 30 , __ , 10

So going backward, we go from higher to lower:

- After 30 (going backward): 40, 50
- Before 10: 20

So:
- 50, 40, 30, 20, 10

✔ Answer: `50, 40, 30, 20, 10`

---

#### 4.
`__, 70, __, 50, __`

This is also backward skip counting.

But let’s see:
We have:
__ , 70, __, 50, __

Since we’re skipping by 10s, and going backward:

- After 70: 60
- Before 50: 60? Wait — that doesn't work.

Wait — maybe it's not strictly backward. Let’s check the logic.

Let’s assume it's still backward skip counting, so decreasing by 10.

But look at the sequence:
_ , 70, _ , 50, _

If we're going backward (from high to low), then:

- Before 70: 80
- Then 70
- Then 60
- Then 50
- Then 40

So:
80, 70, 60, 50, 40

✔ Answer: `80, 70, 60, 50, 40`

---

5. Fill in the missing numbers below.

Now this section has yellow boxes — likely just continuing the same idea.

#### 5.
`__, 20, __, __, __`

We are counting by 10s.

- Before 20: 10
- Then 20
- Then 30
- Then 40
- Then 50

So:
10, 20, 30, 40, 50

✔ Answer: `10, 20, 30, 40, 50`

---

#### 6.
`__, __, 60, __, __`

Again, skip counting by 10s.

- Before 60: 50, 40
- After 60: 70, 80

So:
40, 50, 60, 70, 80

✔ Answer: `40, 50, 60, 70, 80`

---

✔ Final Answers:

1. `10, 20, 30, 40, 50`
2. `30, 40, 50, 60, 70`
3. `50, 40, 30, 20, 10`
4. `80, 70, 60, 50, 40`
5. `10, 20, 30, 40, 50`
6. `40, 50, 60, 70, 80`

---

🔍 Explanation:

- Skip counting by 10s means adding or subtracting 10 each time.
- In forward counting: increase by 10 (e.g., 10, 20, 30...)
- In backward counting: decrease by 10 (e.g., 50, 40, 30...)
- Always check the known numbers to determine direction and pattern.

Let me know if you'd like a printable version or visual explanation!