MATH 2 Lesson on Subtraction with Regrouping and Problem Solving

​Today, we will learn and master

SUBTRACTING NUMBERS THROUGH THOUSANDS WITH REGROUPING AND PROBLEM SOLVING

​How do we subtract numbers with regrouping?

When does regrouping happen in Subtraction?

When is subtraction applied in Problem Solving?

Let us discover and learn

these skills.

​RECALL

What is the difference between 80 and 13?

______

(Show your solution on the white board.)

How is subtraction applied in Problem Solving?

Here is the PROBLEM.

PROBLEM

Karla is 16 years younger than James.

If James is 53 years old, how old is Karla?

(Show the 3 steps on the white board.)

Step 1: N.S. _________

Step 2: Solution: (vertically)

Step 3: Answer ___________

GOOD JOB!

Let us try this.

Are you Ready for a

PRACTICE ACTIVITY?

(Teacher guided activity.)

Multiple Choice

What is the difference between 60 and 47?

• 12

• 13

• 15

• 26

Multiple Choice

Peter has P250 while Karen has P138. How much greater does Peter have than Karen?

• P 100 greater

• P 111 greater

• P 112 greater

• P 132 greater

Multiple Choice

What is the correct operation that must be applied in this problem?

 

PROBLEM:

Joy saved P300. She spent P96 for food. How much is left in her savings?

• Addition

• Subtraction

• Multiplication

• Division

Multiple Choice

Carlo is 14 years younger than Ben. If Ben is 32 years old, how old is Carlo?

• 15 years old

• 16 years old

• 17 years old

• 18 years old

Multiple Choice

Henry is 15 kilograms lighter than Gary. If Gary weighs 43 kilograms,

what is the sum of their weights?

QUESTION: Which of the following number sentences expresses

the weight of Henry?

• 43 + 15 = N

• 43 - 15 = N

• 43 x 15 = N

• 43 ÷ 15 = N

​How was the Practice Activity?

What is your score?

Share your thoughts about completing this activity.

​After accomplishing this Practice Activity, let us check if you are now able to perform these skills on your own.

Get your notebook and answer the given assessment individually.

Check the items using a red crayon as each slide is flashed. You may volunteer to recite as we check.

​READY?

This is your

formative assessment before taking the Graded SW 1

next meeting.

Multiple Choice

Which of the following is the value of N in 500 – 183 = N?

• 307

• 315

• 317

• 327

Multiple Choice

What is the answer?

90 – (25 +16) = ____

• 45

• 46

• 48

• 49

Multiple Choice

You have 54 toys in the box. You shared 18 toys to the orphans.

How many toys do you have now?

• 34 toys

• 36 toys

• 38 toys

• 40 toys

Multiple Choice

Anna buys a pencil that costs P16 and a notepad that costs P29. If she has P50, is it enough to buy these items?

• A. No, it is not enough.

• B. No, her money is less than the amount she bought.

• C. Yes, her money is enough because 16 + 29 = 45 and 45 is less than 50.

• D. Yes, her money is enough because she has P45.

Multiple Choice

Nestor will be 40 years old 12 years from now. How old was he 8 years ago?

• A. He was 28 years old.

• B. He was 20 years old.

• C. He was 12 years old.

• D. He was 8 years old.

​What is your score?

Who got 5/5? Perfect!

Who got 4/5? Good!

Who got 3/5? Practice.

Who got 2/5, 1/5, 0/5? Needs more practice.

Learning Prompt

​How do you answer this situation?

If your younger sibling asks you about subtraction, how would you explain it to him/her?

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​SELF-RATING CHECKLIST

How well do you know the lesson? Choose the letter of your answer.

Be honest. This is how you identify your strengths and weaknesses.

A. I can subtract numbers through thousands with regrouping accurately and solve word problems that involve subtraction and addition correctly.

B. I can subtract numbers through thousands with regrouping accurately and solve word problems that involve subtraction and addition correctly but I still need time to master the skills.

C. I have difficulty in subtracting numbers through thousands with regrouping and solving word problems that involve subtraction and addition.

REFLECTION

​Reflect on this.

Now that you know your strengths and weaknesses, what will you do with your strengths? How about your weaknesses?

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CONGRATULATIONS!

​You have done Lesson 2 well. Thumbs up!

State your Self-Rating (From 1-5, 5 as the highest)

My Self-Rating is ___.

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Be prepared next meeting.

​GRADED SW 1

This covers all about SUBTRACTION in preparation for TEST 2.

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Thank you for your active participation.

​See you next meeting.

Remember!

Mastery is the key to Learning. GOODLUCK!

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