You're working on a worksheet titled
“Multiplying By Whole Tens — Find the missing number.”
This means each problem is in the form:
>
Number × ? = Product
or
>
? × Number = Product
Since we’re multiplying by “whole tens” (like 10, 20, 30, ..., 90), the missing number will also be a whole ten or a single-digit number that, when multiplied by the given ten, gives the product.
---
✔ Strategy:
To find the missing number,
divide the product by the known factor.
Example:
> 60 × □ = 4200
→ □ = 4200 ÷ 60 =
70
Let’s solve all problems step-by-step.
---
## 🔢 Left Column:
1.
60 × □ = 4200
→ 4200 ÷ 60 =
70
2.
□ × 20 = 1800
→ 1800 ÷ 20 =
90
3.
40 × □ = 1600
→ 1600 ÷ 40 =
40
4.
□ × 10 = 200
→ 200 ÷ 10 =
20
5.
90 × □ = 6300
→ 6300 ÷ 90 =
70
6.
□ × 80 = 800
→ 800 ÷ 80 =
10
7.
20 × □ = 400
→ 400 ÷ 20 =
20
8.
□ × 50 = 500
→ 500 ÷ 50 =
10
9.
20 × □ = 400
→ 400 ÷ 20 =
20
10.
□ × 60 = 600
→ 600 ÷ 60 =
10
---
## 🔢 Right Column:
1.
□ × 80 = 800
→ 800 ÷ 80 =
10
2.
20 × □ = 600
→ 600 ÷ 20 =
30
3.
□ × 30 = 900
→ 900 ÷ 30 =
30
4.
80 × □ = 6400
→ 6400 ÷ 80 =
80
5.
□ × 80 = 7200
→ 7200 ÷ 80 =
90
6.
90 × □ = 7200
→ 7200 ÷ 90 =
80
7.
□ × 80 = 5600
→ 5600 ÷ 80 =
70
8.
60 × □ = 3000
→ 3000 ÷ 60 =
50
9.
□ × 40 = 800
→ 800 ÷ 40 =
20
10.
80 × □ = 4800
→ 4800 ÷ 80 =
60
---
##
✔ Final Answers (Left to Right, Top to Bottom):
Left Column:
70, 90, 40, 20, 70, 10, 20, 10, 20, 10
Right Column:
10, 30, 30, 80, 90, 80, 70, 50, 20, 60
---
## 📝 Tip for Students:
When multiplying by whole tens, you can think of it as:
> Multiply the non-zero digits first, then add the zeros from both numbers.
Example:
60 × 70 → 6 × 7 = 42 → Add two zeros →
4200
This helps check your answers quickly!
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✔ You’ve now completed the worksheet correctly! Let me know if you’d like a printable version or more practice problems.
Parent Tip: Review the logic above to help your child master the concept of find the missing factor worksheet.
