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Lesson 9<br />PROBLEM SOLVING INVOLVING SUBTRACTION<br />Objectives<br />After this lesson, the students are expected to:<br />,[object Object]
discuss the different steps in problem solving;
develop the knowledge in problem solving.4126089481542<br />4126089481542<br />To master the application of subtraction in problem solving, here are some examples:<br />Pedro had marbles. He gave away two of his marbles to Juan. If Pedro had twelve marbles, how many marbles left to Pedro after he gave two to Juan?<br />We can use the problem solving plan:<br />1.Know what the problem is.<br />a.What is asked?   How many marbles left to Pedro?<br />b.What are given?  12 marbles of Pedro and 2 to Juan<br />c.What operation to be used?  Subtraction<br />12 – 2 = n12 – 2 = 10   <br />N = 10 marbles left to Pedro.<br />Checking:<br />2 + 10 = n  2 + 10 = 12<br />Another example:<br />Mt. Everest, is 29 028 ft. high, while the Mt. McKinley is 20 320 ft. high. How much is Mt. Everest higher than Mt. McKinley? <br />1.What is asked?  <br />How much Mt. Everest higher than Mt. McKinley?<br />2.What are given?<br />Mt. Everest, is 29 028 ft. high and Mt. McKinley is 20 320 ft. high.<br />3.What operation to be used?<br />Subtraction<br />29 028 – 20 320 = n<br />29 028 – 20 320 = 8 708 ft. <br />Checking:<br />8 708 + 20 320 = n<br />8 708 + 20 320 = 29 028 <br />-344557-140805WORKSHEET NO. 9<br />NAME: ___________________________________DATE: _____________ <br />YEAR & SECTION: ________________________RATING: ___________<br />A. Get one whole sheet of paper and solve the following problem. <br />      <br />,[object Object],-4094922262890___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________.<br />,[object Object],___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________.<br />,[object Object],___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________.<br />,[object Object],___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________.<br />,[object Object],-404241017145___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________.<br />,[object Object],_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________. <br />,[object Object],-372958-492810___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________.<br />,[object Object],___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________.<br />,[object Object],-4138295229235__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________.<br />,[object Object],___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________.<br />
018 lesson 9
018 lesson 9

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018 lesson 9