1, Xiaoming has 15 candy. He ate five and then eight. How many sweets does Xiaoming have now?
Column calculation:
Step 1: Xiaoming ate five sweets, so the number of sweets became 15-5= 10.
Step 2: Xiaoming got eight more sweets, so the number of sweets became 10+8= 18.
Answer: Xiao Ming has 18 candy now.
2. Xiaohong has money from 20 yuan. She spent 6 yuan money on pencils and 8 yuan money on notebooks. How much money does Xiaohong have left?
Column calculation:
Step 1: Xiaohong bought a pencil from 6 yuan, so the remaining money is 20-6= 14 yuan.
Step 2: Xiaohong spent 8 yuan to buy a notebook, so the remaining money is 14-8=6 yuan.
Answer: Xiaohong still has 6 yuan.
These calculation problems can help grade two students practice addition and subtraction and understand the basic concepts and steps of mathematical operation.
Steps of Mathematical Operation in Senior Two:
1. Understanding the problem: First, you need to understand the content and requirements of the problem. For simple operations, such as addition or subtraction, students should understand the significance and operation methods of the operation. For more complex operations, such as multiplication or division, students need to understand the principles and steps of operation.
2. List the known figures: Before starting the operation, students should clearly list the known figures given in the questions. This helps students to better understand the problem and ensure correct operation.
3, choose the right operation: According to the requirements of the problem and the known number, students need to choose the right operation to solve the problem. For example, if you need to add two numbers, choose the addition operation; If two numbers need to be subtracted, select the subtraction operation; If the sum of multiple numbers is needed, the addition operation is selected; If you need to divide one number by another, please select division operation, etc.
4. Perform calculation: according to the selected operation method, perform calculation and get the result. Students should pay attention to the correct order of steps when doing operations, such as multiplying before adding or dividing before multiplying.
5. Integrate answers: Finally, students should integrate answers to ensure that they meet the requirements of the questions. If the answer needs to be explained or applied to other questions, students should ensure the accuracy and completeness of the answer.