Decomposition 122.
100×3 equals 300.
20×3 equals 60.
2×3 equals 6.
This adds up to 366.
Extended data:
Oral arithmetic and quick mental arithmetic: a teaching mode that is truly synchronized with primary school mathematics textbooks;
1, conference algorithm
Written calculation training, China's current education system is exam-oriented education, and the standard for testing students is the test report card. Then the students' main tasks are to take exams, answer questions and write with a pen. Writing arithmetic training is the main line of teaching. Consistent with the mathematical calculation method in primary schools, it does not use any physical calculation, and can be used freely horizontally and vertically, even adding and subtracting. Computing with a pen is the golden key to opening an intelligent express train.
2. Reasonable
Try to find out. Children should not only learn arithmetic, but also know it. Let children understand the calculation principle and break through the calculation of numbers in spelling. The child completes the calculation on the basis of understanding.
Step 3 practice speed
Speed training, it's not enough just to use pen to calculate problems. There is definitely a time limit for primary school oral arithmetic. It takes time to tell whether it is up to standard, that is, it is not enough to calculate problems, mainly to speed up.
Step 4 enlighten wisdom
Intellectual gymnastics, not simply learning and calculating, focuses on cultivating children's mathematical thinking ability, fully stimulating the potential of the left and right brains and developing the whole brain.
After rapid mental arithmetic training, preschool children can deeply understand the essence of mathematics (including), the meaning of numbers (cardinal number, ordinal number, including), the operation mechanism of numbers (addition and subtraction of numbers with the same number) and the way of mathematical logic operation, so that children can master the method of dealing with complex information decomposition and develop divergent thinking and reverse thinking. The child's brain works fast.