Solving exercises on page 105 of Math textbook for grade 3

Solution for exercise 1 on page 105 of Math textbook for grade 3

Exercise statement:

Mental calculation:

7000 minus 2000 equals

6000 minus 4000 equals

9000 minus 1000 equals

10,000 minus 8000 equals
Answer:

Mentally compute and record the results as follows:

7000 minus 2000 equals 5000

6000 minus 4000 equals 2000

9000 minus 1000 equals 8000

10,000 minus 8000 equals 2000

Solution for Exercise 2 on page 105 of Math textbook for grade 3

Exercise statement:

Mental calculation based on the pattern

3600 minus 600 equals

7800 minus 500 equals

9500 minus 100 equals

6200 minus 4000 equals

4100 minus 1000 equals

5800 minus 5000 equals
Answer:

3600 minus 600 equals 3000

7800 minus 500 equals 7300

9500 minus 100 equals 9400

6200 minus 4000 equals 2200

4100 minus 1000 equals 3100

5800 minus 5000 equals 800

Solution for Exercise 3 on page 105 of Math textbook for grade 3

Exercise statement:

Set up and then compute:

a) 7284 minus 3528 b) 6473 minus 5645

9061 minus 4503 4492 minus 833
Answer:

Solution for Exercise 4 on page 105 of Math textbook for grade 3

Exercise statement:

A warehouse holds 4720 kilograms of salt. Initially, 2000 kilograms of salt are transferred, then 1700 kilograms are transferred. How many kilograms of salt are left in the warehouse? (Solved using two methods)
Answer:

Summary:

Given: 4720 kg

First transfer: 2000 kg

Second transfer: 1700kg

Remaining: ...?kg

Solution

Method 1: Amount of salt remaining after the first transfer:

4720 minus 2000 equals 2720 (kg)

Amount of salt remaining after the second transfer:

2720 minus 1700 equals 1020 (kg)

Answer: 1020 kg

Method 2: The salt transferred twice:

2000 plus 1700 equals 3700 (kg)

Salt remaining in the warehouse after two transfers:

4720 minus 3700 equals 1020 (kg)

Answer: 1020 kg

In addition to the above, students can explore the solution for Exercise on page 49 of Math textbook for grade 3 to enhance their knowledge of Math 3.

Detailed content of the Solution for Exercise on page 50 of Math textbook for grade 3 has been provided for students' reference and preparation to better revise Math 3.

Here is the section Solution for Exercise on page 105 of Math textbook for grade 3. Next, students will continue to be guided with Solution for Exercise on page 106 of Math textbook for grade 3 along with Solution for Exercise on page 108 of Math textbook for grade 3 for better learning.