018 lesson 9

Lesson 9 PROBLEM SOLVING INVOLVING SUBTRACTION Objectives After this lesson, the students are expected to: ,[object Object]

discuss the different steps in problem solving;

develop the knowledge in problem solving.4126089481542 4126089481542 To master the application of subtraction in problem solving, here are some examples: 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? We can use the problem solving plan: 1.Know what the problem is. a.What is asked? How many marbles left to Pedro? b.What are given? 12 marbles of Pedro and 2 to Juan c.What operation to be used? Subtraction 12 – 2 = n12 – 2 = 10 N = 10 marbles left to Pedro. Checking: 2 + 10 = n 2 + 10 = 12 Another example: 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? 1.What is asked? How much Mt. Everest higher than Mt. McKinley? 2.What are given? Mt. Everest, is 29 028 ft. high and Mt. McKinley is 20 320 ft. high. 3.What operation to be used? Subtraction 29 028 – 20 320 = n 29 028 – 20 320 = 8 708 ft. Checking: 8 708 + 20 320 = n 8 708 + 20 320 = 29 028 -344557-140805WORKSHEET NO. 9 NAME: ___________________________________DATE: _____________ YEAR & SECTION: ________________________RATING: ___________ A. Get one whole sheet of paper and solve the following problem. ,[object Object],-4094922262890___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________. ,[object Object],___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________. ,[object Object],___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________. ,[object Object],___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________. ,[object Object],-404241017145___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________. ,[object Object],_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________. ,[object Object],-372958-492810___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________. ,[object Object],___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________. ,[object Object],-4138295229235__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________. ,[object Object],___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________.

018 lesson 9

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018 lesson 9