Addition and subtraction formulas within 1 and 10: for example, 6+4= 10, 7+3= 10, 10-4 = 6, 10-3 = 7.
2. Resolution method: for example,12-5 = (10-2)-5 =10-2-5 = 3.
3. Multiplication method: for example, 9+7 = 9+6+1=15+1=16,10-3 =10-2-/kloc-.
4. Carry method: for example, 8+5 = 8+2+3 =10+3 =13,18-6 =/kloc-0+8-6 =12.
5. Rounding method: for example, 7+9 = 7+3+4+2 =16+2 =18,17-8 =1=
6. Left and right overlapping method: for example, 4+6=(4+4)+2=8+2= 10,15-6 = (15-5)-1=10.
The above skills can help first-year students do oral calculations within 20 minutes more quickly and accurately, and improve their math ability and coping ability. At the same time, these skills also need to be mastered and applied in repeated practice in order to achieve better results.
The meaning of oral calculation:
1. Enhance mathematics ability: Oral calculation helps to cultivate students' agile arithmetic ability, train calculation speed and accuracy, improve mathematics skills and promote mathematics development.
2. Cultivate logical thinking: oral arithmetic depends on the brain to calculate, which increases the application of students' thinking and is very helpful to cultivate students' logical thinking and abstract thinking.
3. Improve self-confidence: Let students get correct answers in a short time through oral calculation, thus enhancing students' self-confidence and sense of self-worth and stimulating students' interest in mathematics.
4. Save time and cost: Oral calculation greatly saves calculation time and cost, especially for jobs that require high calculation speed, such as cashiers and computer exams.
5. Promote brain development: The process of oral calculation can promote the deepening and upgrading of the brain's understanding of mathematical topics, and at the same time, it can also promote the development of the brain and improve cognitive ability.
In a word, verbal arithmetic is very important in daily life and study. Through oral calculation, students' mathematical level, logical thinking, self-confidence and cognitive ability can be improved, and at the same time, time and cost can be saved to better meet the needs of current society and life.