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Are You Ready? Let’s find out. MULTIPLY. 1. .07 6. .75 × .07 × .62 ——— ——— 2. 3.45 7. 68.53 × 3 × 10 ——— ———— 3. 71.22 8. 43.57 × 16 × 100 ———— ———— 4. 5.64 9. 8.93 × 16 × 10 ——— ——— 5. .23 10. 86.34 × 14 × 71 ——— ———— 1 FEEDBACK 1. .0049 2. 10.35 3. 1139.52 4. 90.24 5. 3.22 6. .4650 7. 685.30 8. 4357.00 9. 89.30 10. 6130.14 2 LESSON Solving Word Problems About 1 Multiplication of Decimals In this lesson, you will learn to solve word problems about multiplication of decimals including money. Here’s a problem. Read it carefully. A soap factory gave out wrist watches to 1000 persons. Each wrist watch costs P 1524.00. How much did the factory spend for all the wrist watches? Here’s how to solve the problem step by step. Step 1. Write down the given facts. Given: 1000 persons P 1,524.00 cost of one wrist watch. Step 2. Write down what is asked in the problem. Question Asked: How much did the factory spend for all the wrist watches? Step 3. Write down the operation to be used. Operation: Multiplication. Step 4. Write down the number sentence. Number sentence: 1000 × 1524.00 = N 3 Step 5. Solve the problem. Solution: P 1,524.00 – cost 1 wrist watch × 1000 number of persons given a wrist watch 1,524,000.00 – Total amount spent by the factory for the wrist watches. HERE IS A PROBLEM FOR YOU TO SOLVE. FOLLOW THE STEPS. Mrs. Torres, a store owner, bought 100 sacks of rice at P 550.00 each. How much did she pay for all the sacks of rice? Step 1. Write down the given facts. Given: Step 2. Write down what is asked in the problem. Question Asked: Step 3. Write down the operation to be used. Operation: Step 4. Write down the number sentence. Number sentence: Step 5. Solve the problem. Solution: AFTER WRITING YOUR ANSWERS, RAISE YOUR HAND TO SHOW THAT YOU ARE READY FOR THE GROUP DISCUSSION. 4 Here’s another problem. Read it carefully. Romulo earns P 90.00 a day. How much does he earn in 30 days? Step 1. Given facts: P 90.00 amount earned in a day for 30 days Step 2. Question asked: How much does he earn in 30 days? Step 3. Operation to be used: Multiplication. Step 4. Number sentence: 30 × P 90.00 = N Step 5. Solution: P 90.00 amount earned in a day × 30 number of days ———— P 2,700.00 amount earned in 30 days. 5 HERE’S A PROBLEM FOR YOU TO SOLVE. FOLLOW THE STEPS. USE YOUR ANSWER SHEET. A man drove 42.5 km per hour. How many kilometers did he drive in 8 hours? Step 1. Given facts: Step 2. Question asked: Step 3. Operation to be used: Step 4. Number sentence: Step 5. Solution: AFTER WRITING YOUR ANSWERS, RAISE YOUR HAND TO SHOW THAT YOU ARE READY FOR THE GROUP DISCUSSION. Now, here’s how to solve a word problem without showing each step. Mrs. Gomez, a dressmaker, bought 60.25 meters of tetoron at P 40.00 per meter. How much did she pay for the cloth? Solution: P 40.00 × 60.25 ———— 20000 8000 0000 24000 ———— 2,410.0000 – amount paid for the cloth. 6 NOW, SOLVE THIS PROBLEM WITHOUT SHOWING THE STEPS ONE BY ONE. For a school project, each pupil contributed P 25.75. How much was the total collection if there are 2000 pupils? Solution: AFTER WRITING YOUR ANSWERS, RAISE YOUR HAND TO SHOW THAT YOU ARE READY FOR THE GROUP DISCUSSION. Self-Test (Lesson 1) READ EACH PROBLEM CAREFULLY AND SOLVE IT. 1. A softdrink company gave out television sets to 50 persons who won in a grand raffle. Each television set costs P 2395.75. How much did the company spend for all the television sets? 2. Ria bought 36.15 meters of ribbons at P 6.75 per meter. How much did she pay for all the ribbons? 3. Mr. Rodriguez earns P 7,180.85 a month. How much does he earn in 6 months? 4. A sheet of thin paper is 0.004 inch thick. How thick would 85 sheets of paper be? 5. A man drove 62.25 km per hour. How many kilometers did he drive in 6 hours? AFTER WRITING YOUR ANSWERS, RAISE YOUR HAND TO SHOW THAT YOU ARE READY FOR THE GROUP DISCUSSION. 7 Summary In this module, you have learned to solve word problems about multiplication of decimals including money. Here are the steps to follow in solving a word problem. Step 1. Write the given facts. Step 2. Write down what is asked in the problem. Step 3. Write down the operation to be used. Step 4. Write down the number sentence. Step 5. Solve the problem. WHEN YOU ARE READY, GO TO THE TESTING ROOM AND TAKE THE POSTTEST. 8

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posted: | 1/9/2010 |

language: | English |

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