8-2+3=9 (person)
A: There are nine people on board now.
analyse
This topic examines the addition and subtraction problem within 100.
As can be seen from the figure, there were 8 people on board, 2 people disembarked and 3 people boarded. The math question is: How many people are on board now? The result is that the number of people on board minus the number of people disembarking and the number of people on board equals the number of people on board now. That is 8-2+3=9 (person), so you can answer questions.
The addition formula within 1. 100: add 9 minus 1, add 8 minus 2, add 7 minus 3, add 6 minus 4, add 5 minus 6, add 3 minus 7, add 2 minus 8, and add/kloc-0 minus 9.
2. Subtraction formula within 1 00: plus 9 minus 1, plus 8 minus 2, plus 7 minus 3, plus 6 minus 4, plus 5 minus 6, plus 3 minus 7, plus 2 minus 8, plus/kloc-0 minus 9.
Extended data:
Steps to solve application problems in primary school:
1, read the questions carefully and analyze the questions.
2. Be sure to remember the relationship between quantity and quantity accurately, and don't confuse them.
3. According to the relationship between these problems, what are the necessary and important conditions for solving these application problems? Is it known or unknown? You can also judge what method to use in the last step.
4. Under normal circumstances, according to the basic application of arithmetic methods, it is relatively simple to find the total amount; According to the basic relationship of the problem, it is relatively simple to find the component and solve the equation.