Section 1.5 Multiplication of Whole Numbers and Area 39 Multiply Add the carry. Write the 4 in the tens place and carry the 3. Multiply hundreds Add the carry. 1500 3 1800. hundreds Write the 8 in the hundreds place and the 1 in the thousands place. Example 5 demonstrates the process to multiply two factors with many digits. Multiplying a Two-Digit Number by a Two-Digit Number Multiply. 72 83 Solution: Writing the problem vertically and computing the partial products, we have 1 The product is 5976. Multiplying Two Multidigit Whole Numbers Multiply. 368(497) Solution: 2 3 6 7 3 4 6 5 8 497 2576 33120 147200 182,896 4. Estimating Products by Rounding A special pattern occurs when one or more factors in a product ends in zero. Consider the following products: 12 20 240 120 20 2400 12 200 2400 1200 20 24,000 12 2000 24,000 12,000 20 240,000 Example 6 72 83 216 5760 5976 Multiply 3 72. Multiply 80 72. Add. Example 5 5 3 1500. 3 3 6 4 8 5 1840 5 6 tens 300. 300 4 tens 340. 3 3 6 4 8 5 40 Answers 9. 1534 10. 160,564 Multiply 7 368. Multiply 90 368. Multiply 400 368. Skill Practice Multiply. 9. 59 26 Skill Practice Multiply. 10. 274 586
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