How to solve a subtraction problem?
How to solve a subtraction problem?
i will explain it through some examples
The book that I am reading has 15 pages. If I have read 7 pages, how many pages are left for me to read?
This is the easiest type of problem that we will find: it is a short statement,that has only 2 pieces ofdata points and also the data both have the same unit (pages): 15 pages and 7 pages. Now, we are only left to think about which operation we have to do. For that, we are going to analyze: if the book has 15 pages and I have read 7, am I left with more than or less than 15 pages to read? The solution to this question is that I will be left with less than 15 pages to read; therefore, the operation that we have to use is SUBTRACTION.
15 – 7 = 8 I have 8 pages left to read.
2.
Calculate how many lights are melted in my Christmas tree if it has 9 lights in total but only 6 shine.
This problem is of a similar difficulty to the problem before, but what makes it more complicated is the indirect question at the beginning of the statement. In order to know the number of lights that have melted, we are going to analyze the data points pieces that we have: the Christmas tree has 9 lights, but only 6 shine. Therefore, will more than or less than 9 lights have melted? The answer is that less will have melted; therefore, we have to SUBTRACT.
9 – 6 = 3 3 lights have melted.
In Peter’s farm there are 6 chickens and in John’s there are 12. How many fewer chickens are there in Peter’s farm than in John’s?
In this problem, we have to compare the two data points pieces: Peter has 6 chickens and John has 12 chickens. In order to respond to the question of how many chickens Peter has minus John’s chickens, we have to first analyze: who has fewer chickens? The answer is Peter. Therefore, in order to know how many fewer Peter has than John, I will have to find the difference between the two. And for that, we have to SUBTRACT.
12 – 6 = 6 Pedro has 6 chickens less than Juan.
hope you will understand
The book that I am reading has 15 pages. If I have read 7 pages, how many pages are left for me to read?
This is the easiest type of problem that we will find: it is a short statement,that has only 2 pieces ofdata points and also the data both have the same unit (pages): 15 pages and 7 pages. Now, we are only left to think about which operation we have to do. For that, we are going to analyze: if the book has 15 pages and I have read 7, am I left with more than or less than 15 pages to read? The solution to this question is that I will be left with less than 15 pages to read; therefore, the operation that we have to use is SUBTRACTION.
15 – 7 = 8I have 8 pages left to read.
2.
Calculate how many lights are melted in my Christmas tree if it has 9 lights in total but only 6 shine.
This problem is of a similar difficulty to the problem before, but what makes it more complicated is the indirect question at the beginning of the statement. In order to know the number of lights that have melted, we are going to analyze the data points pieces that we have: the Christmas tree has 9 lights, but only 6 shine. Therefore, will more than or less than 9 lights have melted? The answer is that less will have melted; therefore, we have to SUBTRACT.
9 – 6 = 33 lights have melted.
In Peter’s farm there are 6 chickens and in John’s there are 12. How many fewer chickens are there in Peter’s farm than in John’s?
In this problem, we have to compare the two data points pieces: Peter has 6 chickens and John has 12 chickens. In order to respond to the question of how many chickens Peter has minus John’s chickens, we have to first analyze: who has fewer chickens? The answer is Peter. Therefore, in order to know how many fewer Peter has than John, I will have to find the difference between the two. And for that, we have to SUBTRACT.
12 – 6 = 6Pedro has 6 chickens less than Juan.
hope you will understand
Help her solve the problem.
