TOPIC: Solving two-step word problems

OBJECTIVE

Solve two-step word problems involving addition and subtraction of 2 -to 3 digit numbers including money using appropriate procedures (Operation to be used, Number sentence and the Correct Answer)

PREREQUISITE CONCEPTS AND SKILLS

1. Concept of addition 2. Concept of Subtraction

21

MATERIALS

1. Number Cards 4. Activity Sheets

2. Show Me Board 5. Window Cards (A1 and S1)

3. Flask Cards 6. Mystery Box of Knowledge

INSTRUCTIONAL PROCEDURE

A. Preparatory Activity 1. Drill

Strategy: “MY FAMILY” Instructions:

Ask the pupils to enumerate as many as they can “addition and subtraction facts” with sum and difference of 21.

They will be given 5 minutes to perform the activity.

Pupil/s with more addition and subtraction combinations formed, will be declared as” Mathematics Wizard/s of the day”. His /her name will be

posted on the bulletin board.

Example of addition/subtraction combinations of 21

10 + 11=21 41- 20 = 21 32-11 = 21 12 + 9 = 21 51- 30 = 21 33-12= 21 13 + 8 = 21 31 – 10= 21 34-13 = 21 9+ 12 = 21 8 + 13 = 21 7 + 14 = 21 6 + 15 = 21 5 + 16 = 21 2. Review

Solving Word problems-“What is asked and what are given” Strategy: “PROBLEM SOLVING STRATEGY”

Instructions:

Divide the class into three learning stations

Distribute the prepared word problems to each group Pupils will solve the problems in 30 seconds

As soon as they finish solving the problems, members of the learning station will SAY-“ WE MADE IT- PROBLEM SOLVED”

EXAMPLES OF PROBLEMS

What is asked in the problem? _______________________________ What are given? __________________________________________

What is asked in the problem? _______________________________ What are given in the problem? ______________________________

What is asked in the problem? ______________________________ What are given in the problem? _____________________________ 1. Motivation

Strategy: “STORY TELLING” “AT SCHOOL FAMILY DAY”

Processing:

Comprehension Questions

What kind of pupil is Jomar?

What did he sell?

If you were Jomar, are you willing to sell banana cake? Why?

Analyzing the problem

What is asked in the problem? What are given in the problem? What is the mathematical sentence?

What operations are to be used to solve the problem? What is the correct answer?

There are twelve red marbles, twenty-four yellow marbles and seventeen green marbles in a box. Find the total number of marbles.

Laura, teacher of grade 3 students has 84 gifts for her students. There are 67 students and each received one gift from the teacher. Find the number of gifts remaining with Laura.

Bella has to solve 125 Math problems. She solved 46 problems yesterday and 53 problems today. How many problems are to be solved?

Jomar has 475 boxes of banana Cake to sell during the School Family Day. At the end of the day, 174 boxes were unsold. How many boxes were sold?

Presentation

Present a story word problem written on the manila paper.

Analyzing the problem

What is asked in the problem? ______________________________ What are given in the problem? _____________________________ What operations are to be used? ____________________________ What is the mathematical sentence?__________________________ What is the correct answer? _________________________________

Analyzing the problem

What is asked in the problem? ______________________________ What are given in the problem? _____________________________ What operations are be used? ______________________________ What is the mathematical sentence? _________________________ What is the correct answer? ________________________________ 3. Reinforcing Activity - Refer to the LM 38 Gawain 1-3

4. Application-Refer to LM No -Gawain

Read the following problems. Then solve by answering the questions asked.

6. Generalization

Mother Tina and Brother Jay picked eggplant in their family vegetable garden. Mother Tina picked 156 eggplants and Brother Jay picked 120. Mother Tina sold 250 pieces of eggplants in the market. How many eggplants were left?

Joy had some Christmas cards to sell. After she sold 47 of them, she still has 44 cards left to sell. How many cards did Joy have before?

STEPS TO REMEMBER IN SOLVING TWO-STEPS WORD PROBLEMS INVOLVING ADDITION AND SUBRTACTION. What is asked in the problem?

What are given in the problem? What operations are to be used?

Transforming the word problem into Number Sentence Solve for the Final Answer

EVALUATION

Read the following problems. Write the operations are to be used,

transforming the word problem into a number sentence and the final answer.

1. Coco has to solve 125 Math problems. She solved 46 problems yesterday and 53 problems today. How many problems are to be solved yet?

What operations are to be used? ___________________________________ What is the mathematical sentence? ________________________________ What is the final answer? ________________________________________ 2. Rinarose arranges a small party for her eleventh birth day with an amount of P10 000. She bought spaghetti for P 812.50, cake for P 2 580, cookies for P 1 424 and French fries for P1 914. Find the balance amount of Rose.

What operations are to be used? _______________________________ What is the mathematical sentence? ____________________________ What is the final answer? ______________________________________ 3. Mrs. Bautista was given 25 cards for her collections. She now has 95 in all. How many cards did she have before?

What operations are to be used? _________________________________ What is the mathematical sentence? ______________________________ What is the final answer? _______________________________________ 4. Maricel needs pots for her flowering plants. Clay pots cost P 50.00 each and ceramic pots cost P 65.00 each. How much money will Maricel spend if she buys 3 of each kind of pots?

What operations are to be used? _________________________________ What is the mathematical sentence? _____________________________ What is the final answer? _______________________________________ 5. Conrad has a big basket of fruits. He has 95 mangoes. He put 35 ripe mangoes and 29 green mangoes in a small basket. How many mangoes remained in the big basket?

What operations are to be used? _________________________________ What is the mathematical sentence? ______________________________

What is the final answer? ________________________________________

HOME ACTIVITY

Teaching Guide for Mathematics Grade 2 Addition

Lesson 39

TOPIC: Solving two-step word problems involving addition and subtraction OBJECTIVE

Solves two-step word problems involving addition and subtraction of 2- to 3- digit numbers including money using appropriate procedures

PREREQUISITE CONCEPTS AND SKILLS

1. Concept of Addition 2. Concept of Subtraction 3. Order of Operations

4. Analyzes and solves one-step word problems involving subtraction

MATERIALS

1. Number Cards 3. Activity Sheets

2. Show Me Board 4. Mystery Box of Knowledge

INSTRUCTIONAL PROCEDURE

A. Preparatory Activity 1. Drill

Lesson: Order of Operations Strategy: Game- RACE TO FIVE Instructions:

Place the number cards inside the Mystery Box of Knowledge The teacher will draw the number cards in the Mystery Box of Knowledge

Then, she/he will show the mathematical sentence written in the number cards

Pupils will answer the mathematical sentence simultaneously. The first pupil/s to have five correct answers win/s the game. Examples of Number Cards

1. 10 + 12 – 17 = _____ 6. 18 – 15 + 6 = ______ 2. 20 – 5 + 25 = _____ 7. 12 + 18 – 20 = ______ 3. 15 + 12 – 25 = ________ 8. 18 – 12 + 25 = _______ 4. 25 – 21 + 15 = ________ 9. 17 + 15 – 18 = _______ 5. 16 + 15 – 14 = ________ 10. 18 – 15 + 18 = ______

2. Review

Lesson: Analyzes and solves one-step word problems involving addition or subtraction

Instructions:

Divide the class into three learning stations

Distribute the prepared word problems to each group. The group will solve the problems within the allotted time

As soon as they finish solving the problems, members of the learning station will SAY- WE CAN DO IT.

Examples of the Problems

What is asked? __________________________________ What are given? ___________________________________ What operation should be used? ___________________ What is the mathematical sentence? _______________ What is the final answer? ___________________________

What is asked in the problem? _______________________ What are given? ____________________________________ What operation should be used? _____________________ What is the mathematical sentence? _________________ What is the final answer? ___________________________

What is asked in the problem? __________________________ What are given? _______________________________________ What operation should be used? _______________________ What is the mathematical sentence? ___________________ What is the final answer? _______________________________

The Boy Scout Council of the MIMAROPA Region sent 540 scouts to the National Scouting Jamboree at Mount Makiling. Western Visayas Region sent 568 scouts. How many scouts were sent by the two regions?

The Grade I pupils collected 376 used soft drink straws. The Grade II pupils collected 675 used soft drink straws. How many used soft drink straws did the Grades I and II collect in all?

Mang Caloy is a baker and sold 445 loaves of bread and had 97 loaves of bread left. How many loaves of bread did he have at first?

B. Developmental Activities 1. Motivation

Ask the pupils:

What is your father’s occupation?

What is the importance of the farmers in the community? What is the importance of the farmers in our country? What are the contributions of the farmers in our economy? 2. Presentation

Present this story problem.

Processing:

What is asked in then problem? _________________________ What are given? _____________________________________ How many operations should be used in solving the problem? ____ What are they? __________________________________________ What are the word clue/s you identify the operations to be used in solving the problem? ___________________________________ What is the mathematical sentence? _______________________ What is the final answer? ________________________________ Present another story problem:

3. Reinforcing Activity – Refer to LM 39 - Gawain 4. Application

5. Generalization

What are the steps in solving a 2-step word problem involving addition and subtraction including money?

EVALUATION

Read, analyze and solve the following problems. Then answer the questions after each problem.

1. There are 245 Grade II pupils in Montfort Academy. Of these124 are boys. How many are girls?

Mang Digoy is a farmer. He has 356 cavans of rice to sell. He sold 98 cavans yesterday and 145 canvans today. How many cavans of rice were left to him?

Raymund harvested 670 pineapples. He sold 345 pineapples on Monday and 156 pineapples on Tuesday. How many pineapples were not sold?

What is asked in the problem? ___________________________________ What are given? ______________________________________________ What operations should be used? _________________________________ What is the number sentence? ___________________________________ What is the final answer? ________________________________________ 2. Mrs. Talastas sold coconut butter for P 120.00 and ube jam for P 75.00. She gave P 65.00 of her sale to her daughter. How much was left to her?

What is asked in the problem? ______________________________ What are given? _________________________________________ What operations should be used? ___________________________ What is the number sentence? _____________________________ What is the final answer? _________________________________

What is asked in the problem? ______________________________ What are given? _________________________________________ What operations should be used? ___________________________ What is the number sentence? _____________________________ What is the final answer? __________________________________

HOME ACTIVITY

Refer to the LM 39 – Gawaing Bahay

Teaching Guide for Mathematics Grade 2 Multiplication

Lesson 40