Multiplying by 10s worksheet with 40 problems and a salamander theme.

Let's solve the multiplication problems on "Multiplying by 10s Sheet 2" step by step.

The key concept here is understanding how to multiply numbers that involve multiples of 10. As the hint says:

> If $3 \times 7 = 21$, then:
> - $30 \times 7 = 210$ (because 30 is 3 × 10, so you add a zero)
> - $3 \times 70 = 210$ (because 70 is 7 × 10, so again, you add a zero)

So, whenever one of the numbers ends in zero, we can:
- Multiply the non-zero parts first.
- Then add the zeros at the end.

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✔ Let's go through each problem:

#### Left Column (1–20):

1) $30 \times 4 = 120$
→ $3 \times 4 = 12$, add one zero → 120

2) $2 \times 50 = 100$
→ $2 \times 5 = 10$, add one zero → 100

3) $40 \times 2 = 80$
→ $4 \times 2 = 8$, add one zero → 80

4) $50 \times 10 = 500$
→ $5 \times 1 = 5$, add two zeros → 500

5) $20 \times 6 = 120$
→ $2 \times 6 = 12$, add one zero → 120

6) $40 \times 4 = 160$
→ $4 \times 4 = 16$, add one zero → 160

7) $2 \times 70 = 140$
→ $2 \times 7 = 14$, add one zero → 140

8) $80 \times 3 = 240$
→ $8 \times 3 = 24$, add one zero → 240

9) $7 \times 50 = 350$
→ $7 \times 5 = 35$, add one zero → 350

10) $10 \times 30 = 300$
→ $1 \times 3 = 3$, add two zeros → 300

11) $20 \times 0 = 0$
→ Any number times 0 is 0 → 0

12) $7 \times 40 = 280$
→ $7 \times 4 = 28$, add one zero → 280

13) $30 \times 9 = 270$
→ $3 \times 9 = 27$, add one zero → 270

14) $20 \times 10 = 200$
→ $2 \times 1 = 2$, add two zeros → 200

15) $7 \times 70 = 490$
→ $7 \times 7 = 49$, add one zero → 490

16) $60 \times 5 = 300$
→ $6 \times 5 = 30$, add one zero → 300

17) $30 \times 6 = 180$
→ $3 \times 6 = 18$, add one zero → 180

18) $70 \times 10 = 700$
→ $7 \times 1 = 7$, add two zeros → 700

19) $10 \times 40 = 400$
→ $1 \times 4 = 4$, add two zeros → 400

20) $6 \times 30 = 180$
→ $6 \times 3 = 18$, add one zero → 180

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#### Right Column (21–40):

21) $7 \times 60 = 420$
→ $7 \times 6 = 42$, add one zero → 420

22) $60 \times 9 = 540$
→ $6 \times 9 = 54$, add one zero → 540

23) $6 \times 60 = 360$
→ $6 \times 6 = 36$, add one zero → 360

24) $3 \times 70 = 210$
→ $3 \times 7 = 21$, add one zero → 210

25) $90 \times 10 = 900$
→ $9 \times 1 = 9$, add two zeros → 900

26) $6 \times 70 = 420$
→ $6 \times 7 = 42$, add one zero → 420

27) $80 \times 2 = 160$
→ $8 \times 2 = 16$, add one zero → 160

28) $5 \times 60 = 300$
→ $5 \times 6 = 30$, add one zero → 300

29) $8 \times 70 = 560$
→ $8 \times 7 = 56$, add one zero → 560

30) $50 \times 7 = 350$
→ $5 \times 7 = 35$, add one zero → 350

31) $50 \times 9 = 450$
→ $5 \times 9 = 45$, add one zero → 450

32) $7 \times 40 = 280$
→ $7 \times 4 = 28$, add one zero → 280

33) $80 \times 5 = 400$
→ $8 \times 5 = 40$, add one zero → 400

34) $60 \times 7 = 420$
→ $6 \times 7 = 42$, add one zero → 420

35) $8 \times 30 = 240$
→ $8 \times 3 = 24$, add one zero → 240

36) $70 \times 8 = 560$
→ $7 \times 8 = 56$, add one zero → 560

37) $9 \times 60 = 540$
→ $9 \times 6 = 54$, add one zero → 540

38) $2 \times 80 = 160$
→ $2 \times 8 = 16$, add one zero → 160

39) $80 \times 9 = 720$
→ $8 \times 9 = 72$, add one zero → 720

40) $8 \times 60 = 480$
→ $8 \times 6 = 48$, add one zero → 480

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✔ Final Answers:

| Problem | Answer |
|--------|--------|
| 1) | 120 |
| 2) | 100 |
| 3) | 80 |
| 4) | 500 |
| 5) | 120 |
| 6) | 160 |
| 7) | 140 |
| 8) | 240 |
| 9) | 350 |
| 10) | 300 |
| 11) | 0 |
| 12) | 280 |
| 13) | 270 |
| 14) | 200 |
| 15) | 490 |
| 16) | 300 |
| 17) | 180 |
| 18) | 700 |
| 19) | 400 |
| 20) | 180 |
| 21) | 420 |
| 22) | 540 |
| 23) | 360 |
| 24) | 210 |
| 25) | 900 |
| 26) | 420 |
| 27) | 160 |
| 28) | 300 |
| 29) | 560 |
| 30) | 350 |
| 31) | 450 |
| 32) | 280 |
| 33) | 400 |
| 34) | 420 |
| 35) | 240 |
| 36) | 560 |
| 37) | 540 |
| 38) | 160 |
| 39) | 720 |
| 40) | 480 |

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🔍 Summary Tips:

- When multiplying by multiples of 10, multiply the non-zero digits, then add the total number of zeros from both numbers.
- Example: $60 \times 70 = ?$ → $6 \times 7 = 42$, and there are two zeros, so answer is 4200 (but not needed here).
- Practice helps build fluency with multiplication facts and place value.

Let me know if you'd like this as a printable sheet or need explanations for any specific problem! 😊