Problem Description:
The task involves solving a series of multiplication problems. Each problem consists of multiplying two numbers. We will solve each multiplication step by step.
---
Step-by-Step Solution:
####
Row 1:
1.
623 × 20
- Multiply 623 by 2: \( 623 \times 2 = 1246 \)
- Add a zero at the end (because we are multiplying by 20): \( 12460 \)
-
Answer: \( 12460 \)
2.
312 × 14
- Break it into parts: \( 312 \times 10 + 312 \times 4 \)
- \( 312 \times 10 = 3120 \)
- \( 312 \times 4 = 1248 \)
- Add the results: \( 3120 + 1248 = 4368 \)
-
Answer: \( 4368 \)
3.
478 × 83
- Use long multiplication:
```
478
× 83
------
1434 (478 × 3)
3824 (478 × 8, shifted one place to the left)
------
39754
```
-
Answer: \( 39754 \)
4.
745 × 52
- Use long multiplication:
```
745
× 52
------
1490 (745 × 2)
3725 (745 × 5, shifted one place to the left)
------
38740
```
-
Answer: \( 38740 \)
---
####
Row 2:
5.
947 × 61
- Use long multiplication:
```
947
× 61
------
947 (947 × 1)
5682 (947 × 6, shifted one place to the left)
------
57767
```
-
Answer: \( 57767 \)
6.
541 × 24
- Use long multiplication:
```
541
× 24
------
2164 (541 × 4)
1082 (541 × 2, shifted one place to the left)
------
12984
```
-
Answer: \( 12984 \)
7.
206 × 72
- Use long multiplication:
```
206
× 72
------
412 (206 × 2)
1442 (206 × 7, shifted one place to the left)
------
14832
```
-
Answer: \( 14832 \)
8.
184 × 38
- Use long multiplication:
```
184
× 38
------
1472 (184 × 8)
552 (184 × 3, shifted one place to the left)
------
6992
```
-
Answer: \( 6992 \)
---
####
Row 3:
9.
329 × 9
- Multiply directly: \( 329 \times 9 = 2961 \)
-
Answer: \( 2961 \)
10.
861 × 5
- Multiply directly: \( 861 \times 5 = 4305 \)
-
Answer: \( 4305 \)
11.
276 × 3
- Multiply directly: \( 276 \times 3 = 828 \)
-
Answer: \( 828 \)
12.
740 × 7
- Multiply directly: \( 740 \times 7 = 5180 \)
-
Answer: \( 5180 \)
---
####
Row 4:
13.
152 × 8
- Multiply directly: \( 152 \times 8 = 1216 \)
-
Answer: \( 1216 \)
14.
648 × 2
- Multiply directly: \( 648 \times 2 = 1296 \)
-
Answer: \( 1296 \)
15.
496 × 6
- Multiply directly: \( 496 \times 6 = 2976 \)
-
Answer: \( 2976 \)
16.
537 × 4
- Multiply directly: \( 537 \times 4 = 2148 \)
-
Answer: \( 2148 \)
---
Final Answers:
\[
\boxed{
\begin{array}{cccc}
12460 & 4368 & 39754 & 38740 \\
57767 & 12984 & 14832 & 6992 \\
2961 & 4305 & 828 & 5180 \\
1216 & 1296 & 2976 & 2148 \\
\end{array}
}
\]
Parent Tip: Review the logic above to help your child master the concept of 4 digit by 3 digit multiplication worksheet.
