Grade : 3 Chapter : 4 Logical Thinking [N.B Work]

 

 New Words:

1. complex

2. approach

3. sequence

4. goal

5. information

6. condition

7. solution

8. tasks

• Keywords:

1. Complex: having many steps.

2. Approach: a way to deal with something.

3. Sequence: the order of steps.

4. Monitor: to check the progress.

5. Respectively: in the given order.

• Blanks:

1. To perform a complex task, you need to break it into simple, smaller steps.

2. The goal is what you want to achieve after completing a task.

3. Conditions are the rules that you need to follow while performing a task.

4.A, AA, AB, AC, AD.

5.4, 6, 9, 13, 18, 24.

• NOTES:

1. Goal: a goal is what you want to achieve at the end of the task.

2. Information: information refers to the other details given in the task to be performed.

3. Conditions: conditions are rules that you need to follow while performing a task.

 

Ø Problem solving using logical thinking

1. Question:

Look at the number pattern below. What number should replace the question mark?

2, 4, 6, 8 ? 12, 14

Ans-1) 1. Identify the Pattern: Notice the numbers increase by 2 each time:

o    2 → 4 (add 2)

o    4 → 6 (add 2)

o    6 → 8 (add 2)

2.  Plan How to Solve It: To continue the pattern, we should add 2 to the last known number (8).

3.  Perform the Task: 8 + 2 = 10.

4.  Write the Answer: The missing number is 10

2. There are 3 baskets. The first basket has 4 apples, the second has 5 bananas, and the third basket has 6 oranges. How many pieces of fruit are there in total?

Ans-2)   1. Identify the Important Information:

o      First basket: 4 apples

o      Second basket: 5 bananas

o      Third basket: 6 oranges

       2. Plan How to Solve It: We need to add the number of apples, bananas, and oranges together.

        3. Perform the Task: 4 apples + 5 bananas + 6 oranges = 15 fruits in total.

        4. Write the Answer: There are 15 pieces of fruit in total

Ø stepwise approach to performing task

1. What do plants need to grow?

·Stepwise Answer:

1.  Read the Question: The question is asking what plants need to grow.

2.  Identify Important Information: We are talking about plants and their needs.

3.  Plan the Answer: Think about what you know plants need (like water, sunlight, and soil).

4.  Solve: Plants need sunlight, water, and soil to grow.

5.  Write the Answer: Plants need sunlight, water, and soil to grow.

6.  Check: Plants really do need these things. The answer is correct.

22. You have 20 rupees. You want to buy 3 toys that cost 5 rupees each. How much money will you have left after buying the toys?

Stepwise Answer:

1.  Read the Question: You need to find out how much money you will have left after buying toys.

2.  Identify Important Information: You have 20 rupees, each toy costs 5 rupees, and you want to buy 3 toys.

3.  Plan How to Solve It: First, calculate how much all 3 toys will cost. Then, subtract that from 20 rupees to find how much money you’ll have left.

4.  Perform the Task: Multiply 5 rupees (cost of one toy) by 3 (number of toys):
5 × 3 = 15 rupees.
Now, subtract the total cost from your original amount:
20 − 15 = 5 rupees.

5.  Write the Answer: After buying the toys, you will have 5 rupees left.

6.  Check Your Work: Multiply 5 × 3 = 15, then 20 − 15 = 5. The answer is correct.

33. You have 3 shelves. On each shelf, you can fit 5 books. How many books can you fit on all 3 shelves?

Stepwise Answer:

1.  Read the Question: You need to find out how many books can fit on all 3 shelves.

2.  Identify Important Information: There are 3 shelves, and each shelf can fit 5 books.

3.  Plan How to Solve It: To find out the total number of books, you need to multiply the number of shelves by the number of books each shelf can hold.

4.  Perform the Task: Multiply 3 shelves × 5 books per shelf = 15 books.

5.  Write the Answer: You can fit 15 books on all 3 shelves.

6.  Check Your Work: Multiply 3 × 5 = 15. The answer is correct.