1. 2-5
Example 2
Find the product of 87 and 39. Use the traditional multiplication method.
1. Estimate.
90 × 40 = 3,600
Lesson 4-13 Example 2

2. 2-5
Example 2
Find the product of 87 and 39. Use the traditional multiplication method.
2. Rewrite the problem in vertical format.
87 × 39
Lesson 4-13 Example 2

3. 2-5
Example 2
Find the product of 87 and 39. Use the traditional multiplication method.
3. Multiply 9 times the digit in the ones column.
9 × 7 = 63
Write the tens digit above the tens column and the ones digit in the product under the ones column. 6
87 × 39 3
Lesson 4-13 Example 2

4. 2-5
Example 2
Find the product of 87 and 39. Use the traditional multiplication method.
4. Multiply 9 times the tens column.
9 × 8 = 72
Add the 6 tens to get 78. 6
87 × 39 78 3
Lesson 4-13 Example 2

5. 2-5
Example 2
Find the product of 87 and 39. Use the traditional multiplication method.
5. Multiply the value of the digit in the tens place times 7.
30 × 7 = 210
Write the hundreds digit above the hundreds column and the tens digit in the product under the tens column. 2
87 × 39 78 3 10
Lesson 4-13 Example 2

6. 2-5
Example 2
Find the product of 87 and 39. Use the traditional multiplication method.
6. Multiply the value in the tens column by 30.
30 × 8 = 240
Add 2 tens to get 260. Write the 26 in the hundreds place. 2
87 × 39 78 3
2,6 10
Lesson 4-13 Example 2

7. 2-5
Example 2
Find the product of 87 and 39. Use the traditional multiplication method.
7. Find the sum of the two products. 2
87 × 39 78 3
______ ,393 +
2,610
Lesson 4-13 Example 2

8. 2-5
Example 2
Find the product of 87 and 39. Use the traditional multiplication method.
8. The product is 3,393. Compare to your estimate for reasonableness.
Lesson 4-13 Example 2