In fact, children also want to finish their homework quickly so that they can have more time to play, but the more anxious they are, the more they can't figure it out. Parents are anxious about their children and can't get results. From now on, I will teach you two ways to make children's mathematics easy and simple!
Ten-point method
What is the ten-point method? In fact, the method of filling ten is very simple, that is, the carry addition within 20 is converted into the calculation problem of 10+N, which belongs to an arithmetic method from difficult to simple. For example, 7+3= 10, 3+7= 10. A simple version of the "poly 10 rule", such as 8+5, which is relatively difficult, can be obtained by dividing 5 into 3 and 2, then 8+2= 10, and adding 3.
How to use the ten-point method? Divide children's problems into different categories. If they are less than 20, we can split one of the numbers and add another number to "10", and then add an extra number to work out the answer. This is quick and time-saving, and it can also prevent children from hating mathematics and forming an attitude of being tired of learning.
Advantages of ten-point method Ten-point method is of great benefit to children, which can improve their logical thinking to a certain extent and help them form correct mathematical logic. Many times, the school will teach children to use vertical input operation in the teaching process. However, once you master the method of making up ten, once you are proficient, children can calculate directly with their brains, which will be much faster than other children.
Once he surpasses other friends, he can build up good self-confidence, think that arithmetic is not very difficult, and he is interested in arithmetic.
Finger fast calculation
What is finger quick calculation? "Finger quick calculation-palm quick calculation" is a quick calculation method invented by Niu Hongwei, a teacher in Xi 'an.
It is a mathematical operation method without abacus.
For a long time, people always calculate by hand or with the help of other calculators (such as abacus and computer). In fact, every normal person's hand is also a perfect calculator, and six operations such as addition, subtraction, multiplication, division, square and square can be performed with the palm of his hand.
Its operation speed (after a certain period of practice, of course), addition and subtraction can rival electronic computers, multiplication and division are faster than abacus calculation, and square calculation is much faster than pen calculation. In a program, a little girl used this method. When the four digits 15 are added up, it only takes her 12 seconds. There should be no other way to achieve this speed.
How to calculate quickly with your fingers? Make fists with both hands, palms inward, and keep your fists at an appropriate distance. Raise your arms. Starting from the index finger of the right hand, the index finger, middle finger, ring finger and tail finger represent 1, 2, 3 and 4 respectively. Four fingers retracted, thumb extended, representing 5; When counting to 9, retract the extended five fingers, and the extended left index finger represents10; 1 1?
The index finger of the left hand does not move, and the index finger of the right hand extends again, and then goes down to19 in turn; Take back the five fingers of the right hand and the middle finger of the left hand is 20. When you count to 49, retract the fingers of your right hand and left hand. The thumb of your left hand represents 50, and so on to 99.
In fact, there are some formulas that children can easily remember, and I will sort them out for everyone: 1, finger positioning formula.
I have a pair of hands, representing ninety-nine; I will set ten for my left hand and ninety for me.
Pose your right hand and count from one to nine; It's convenient to add and subtract, so don't worry about calculation.
2, hand index formula
The index finger extends "1" and the middle finger extends "2"; The ring finger is "3" and the little finger is "4"; Four fingers and a thumb, the thumb is "5" to remember; Then extend the index finger to the little finger, and "6", "7", "8" and "9" are arranged in numbers.
3. Practice the formula with your right finger.
Take the lead, two tigers contend, in a few words, the four seas are at home, and the grain is abundant.
Six animals are thriving, and the eight immortals are crossing the sea, and nine Niu Yi hairs are urgent.
A word nine, two dragons playing with pearls, three pillars separated, surrounded by enemies, the grain is abundant.
Six gods without a master, seven ups and downs, exquisite, nine Niu Yi hairs, perfect.
(Note: When reading "urgent" or "perfect", make a fist in your right hand and put "1" in your left hand, indicating carry. )
4. The left hand points out the exercise formula: ten, twenty, thirty, forty; Fifty, sixty, seventy, eighty, ninety, one hundred.
(Note: When reading "100", clap your hands, and then put your fist on your chest. )
Advantages of finger speed calculation Children who use finger speed calculation will be faster than many people in calculation. As a child, it may be simple addition and subtraction. The square of multiplication and division in the later period will be much faster. It can eliminate the burden of children doing math problems and have a happy process of learning math.