Natural Number Subtraction Exercises

Warm-up with figures

Solved Subtraction Exercises - Elementary School I

1. Simple Subtraction

Statement: João had 10 bullets and gave 4 to his friend. How many bullets does João have now?

Resolution: To find the amount of candy that John now has, we subtract the amount he gave from the initial amount he had:

Answer: John has 6 bullets now.

2. Subtraction with Natural Numbers

Statement: In the library, there were 15 books and 6 of them were taken by the students. How many books are still in the library?

Resolution: To know how many books are still in the library, we must subtract the number of books checked out from the total number of books:

Answer: There are 9 books in the library.

3. Subtraction with Context

Statement: A box contains 20 toys. If 8 toys were taken out of the box to be donated, how many toys are left in the box?

Resolution: Let’s calculate how many toys are left in the box by subtracting the donated toys from the total:

Answer: There are 12 toys left in the box.

4. Subtraction in an Everyday Situation

Statement: Ana has 30 stickers. She lost 12 stickers. How many stickers does Ana still have?

Resolution: To find out how many stickers Ana still has, we subtract the number of lost stickers from the total she had:

Answer: Ana still has 18 stickers.

5. Problem with More Numbers

Statement: In a classroom, there were 25 students. If 7 students went home early, how many students are still in the room?

Resolution: We subtract the number of students who went home from the total number of students in the room:

Answer: There are 18 students still in the classroom.

Solved Subtraction Exercises - Elementary School II

1. Simple Subtraction

Statement: A tank contains 1500 liters of water. If 375 liters were removed to fill a tank, how many liters of water remain in the tank?

Resolution: To find out how much water remains in the tank, we subtract the amount removed from the total:

Answer: 1125 liters of water remain in the tank.

2. Subtraction in a Real Context

Statement: An athlete ran 2.750 meters in his first race and 1.200 meters in the second race. What is the difference in distance he ran between the two races?

Resolution: To calculate the difference in distance between the two races, we subtract the distance of the second race from the distance of the first race:

Answer: The athlete ran 1550 more meters in the first race compared to the second.

3. Problem with Natural Numbers

Statement: In a store, there were 500 t-shirts in stock. After a big sale, there were 235 t-shirts left. How many t-shirts were sold?

Resolution: To find the number of t-shirts sold, we subtract the remaining quantity from the initial quantity:

Response: 265 t-shirts were sold.

4. Subtraction in Class Situations

Statement: A classroom has 36 students. If 9 students missed class, how many students were present?

Resolution: To calculate how many students were present, we subtracted the number of absent students from the total number of students:

Answer: There were 27 students in the room.

5. Problem with Multiple Elements

Statement: A library has 1.200 books. After a donation, the library received more 350 books. If then 275 books were borrowed, how many books does the library now have?

Resolution: First, let’s add the books received to the initial quantity:

Then we subtract the borrowed books:

Answer: The library now has 1275 books.

Solved Subtraction Exercises - High School

1. Subtraction of Natural Numbers

Statement: A company had 4.250 products in stock at the beginning of the month. During the month, 1.785 products were sold. How many products were left in stock at the end of the month?

Resolution: To determine the quantity of products remaining, we subtract the quantity sold from the initial total:

Response: There were 2.465 products left in stock at the end of the month.

2. Data Analysis

Statement: In a survey carried out, 1.200 people answered a questionnaire about consumption habits. Among them, 800 stated that they usually buy organic products. How many people don’t buy organic products?

Resolution: To find the number of people who do not buy organic products, we subtract the number of people who buy from the total number of respondents:

Answer: 400 people don’t buy organic products.

3. Finance Problem

Statement: A student started the month with 750,00 reais. After spending 250,00 reais on books and 150,00 reais on transportation, how much money does he still have?

Resolution: First, we add up the expenses:

Then, we subtract the expenses from the initial total:

Answer: The student still has 350,00 reais.

4. Performance Analysis

Statement: In a mathematics competition, 150 students signed up, but only 100 showed up on the day. If 30 students withdrew before the competition, how many students were actually interested in participating?

Resolution: First, we calculated how many students dropped out and how many attended. The number of students who registered and did not attend is:

Thus, the number of students who were interested (registered minus those who dropped out) is:

Response: 120 students were really interested in participating.

5. Subtraction in an Everyday Situation

Statement: A factory produced 5.000 parts of a product in one month. If, at the end of the month, 1.250 parts were rejected due to defect, how many parts were approved?

Resolution: To calculate the number of approved parts, we subtract the rejected parts from the total produced:

Response: 3.750 parts were approved.

Solved Subtraction Exercises - Entrance Exams

1. Logical Reasoning Problem

Statement: In a competition, 2.500 candidates registered. If 1.235 candidates did not appear on the day of the test, how many candidates actually participated in the competition?

Resolution: To find out how many candidates participated, we subtracted the number of candidates who did not attend from the total number of registrants:

Answer: 1.265 candidates participated in the competition.

2. Finance Problem

Statement: A student has 1.200,00 reais. After paying R$ 350,00 in monthly fees and 200,00 reais in transportation, how much money does he still have?

Resolution: First, we add up the expenses:

Then, we subtract the expenses from the initial total:

Answer: The student still has 650,00 reais.

3. Sales Analysis

Statement: A store sold 3.600 products in January. The following month, 1.245 products were undersold. How many products were sold in February?

Resolution: To find the number of products sold in February, we must subtract the difference in January sales:

Answer: The store sold 2.355 products in February.

4. Population Problem

Statement: A city had a population of 150.000 inhabitants. After a census, it was found that 12.345 inhabitants had moved away from the city. What is the new population of the city?

Resolution: To find the new population, we subtract the number of inhabitants who moved from the initial total:

Answer: The new population of the city is 137.655 inhabitants.

5. Class Situation

Statement: A school had 900 students enrolled at the beginning of the year. After one semester, 125 students dropped out and 75 new students were enrolled. How many students does the school have now?

Resolution: First, we subtract the number of students who dropped out:

Then, we added the new students:

Response: The school now has 850 students enrolled.

Training

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