You’re working on a math worksheet titled
“Multiples of Ten”, which teaches how to multiply numbers by multiples of 10 (like 10, 20, 30, etc.) using a simple trick:
>
Multiply the non-zero digits first, then add the zero(s) from the multiple of ten.
---
✔ Example Given:
> 80 × 4 = 320
> Think: 8 × 4 = 32 → then add one zero →
320
This works because 80 = 8 × 10, so:
80 × 4 = (8 × 10) × 4 = 8 × 4 × 10 = 32 × 10 = 320
---
## 🔢 Let’s solve all the problems step-by-step:
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➤ First Section: “Write the correct answer for these problems”
#### Left Column:
1.
4 × 6 = 24
→ Simple multiplication.
2.
4 × 60 = ?
→ 4 × 6 = 24 → add one zero →
240
3.
40 × 6 = ?
→ 4 × 6 = 24 → add one zero →
240
4.
2 × 5 = 10
→ Simple.
5.
20 × 5 = ?
→ 2 × 5 = 10 → add one zero →
100
6.
2 × 50 = ?
→ 2 × 5 = 10 → add one zero →
100
#### Right Column:
7.
8 × 7 = 56
→ Simple.
8.
80 × 7 = ?
→ 8 × 7 = 56 → add one zero →
560
9.
8 × 70 = ?
→ 8 × 7 = 56 → add one zero →
560
10.
3 × 9 = 27
→ Simple.
11.
3 × 90 = ?
→ 3 × 9 = 27 → add one zero →
270
12.
30 × 9 = ?
→ 3 × 9 = 27 → add one zero →
270
---
➤ Second Section: “Now write the correct answer for these problems”
#### Left Column:
13.
90 × 5 = ?
→ 9 × 5 = 45 → add one zero →
450
14.
60 × 3 = ?
→ 6 × 3 = 18 → add one zero →
180
15.
4 × 30 = ?
→ 4 × 3 = 12 → add one zero →
120
#### Right Column:
16.
20 × 7 = ?
→ 2 × 7 = 14 → add one zero →
140
17.
4 × 80 = ?
→ 4 × 8 = 32 → add one zero →
320
18.
60 × 9 = ?
→ 6 × 9 = 54 → add one zero →
540
---
## 📝 Final Answers (Filled-in Worksheet Style):
```
4 × 6 = 24 8 × 7 = 56
4 × 60 = 240 80 × 7 = 560
40 × 6 = 240 8 × 70 = 560
2 × 5 = 10 3 × 9 = 27
20 × 5 = 100 3 × 90 = 270
2 × 50 = 100 30 × 9 = 270
90 × 5 = 450 20 × 7 = 140
60 × 3 = 180 4 × 80 = 320
4 × 30 = 120 60 × 9 = 540
```
---
## 💡 Key Concept Reminder:
When multiplying by a multiple of 10 (like 10, 20, 30, ..., 90), you can:
1. Ignore the zero(s) and multiply the other digits.
2. Then add back the same number of zeros you ignored.
✔ This trick makes mental math faster and helps build number sense!
Let me know if you’d like to practice more or need visual diagrams! 😊
Parent Tip: Review the logic above to help your child master the concept of multiples worksheet 4th grade.
