1. Lesson 4-8 Example 3 4-8 Find the product of 231 and 7. Estimate first. Step 1 Estimate. 200 × 7 = 1,400

2. Lesson 4-8 Example 3 4-8 Find the product of 231 and 7. Estimate first. 231 × 7 Step 2 Rewrite the problem in vertical format.

3. Lesson 4-8 Example 3 4-8 Find the product of 231 and 7. Estimate first. 231 × 7 Step 3 Multiply 7 times the digit in the ones column. 7 7 × 1 = 7

4. Lesson 4-8 Example 3 4-8 Find the product of 231 and 7. Estimate first. 231 × 7 Step 4 Multiply 7 times the digit in the tens column. 7 1 2 7 × 3 = 21

5. Lesson 4-8 Example 3 4-8 Find the product of 231 and 7. Estimate first. 231 × 7 Step 5 Multiply 7 times the digit in the hundreds column. 7 1 2 Add two for 16. 1,6 7 × 2 = 14

6. Lesson 4-8 Example 3 4-8 Find the product of 231 and 7. Estimate first. Step 6 The product is 1,617. Compare to your estimate for reasonableness.