19 19 years of good friends [1 9].

2828 Hand in hand [2, 8].

3737 is really close [3,7].

Four, six, four, six go together.

Five, five, five, five hands.

Remember large numbers in your mind and decimals in your hand. Mathematics, an intellectual game that can be used to solve difficult problems. IEEE Fellow, an American who won the Kaufman Prize, wrote popular science works for teenagers, which were recommended by nine provinces in Ma Ying as good books for teenagers to read in summer, and were selected as excellent extracurricular books for primary and secondary school students for many times, and won the Golden Globe Award and Open Book Award, so as to cultivate children's thinking ability that will benefit them for life.

Method:

1. Interest in learning mathematics is the premise and foundation. If you are not interested in mathematics, you can't learn well and it is extremely painful to learn. Experience shows that we often invest more time and energy in our favorite subjects, and the results will be better. Therefore, it will be very effective to cultivate students' interest in math learning, from simple to difficult to do math problems.

It's a good habit to preview in advance when learning mathematics. Try to solve the problems in the preview process and do some related exercises to consolidate them. Mark what you don't understand, wait for the teacher to explain in class, and reflect on why you didn't understand when reading.

3. When doing after-school exercises, draw inferences from the formula, give mathematical thinking feedback when reading every known condition, and use various methods such as drawing and trying to solve it, instead of sticking to the unique solution. Students who are good at math can't learn it just by attending classes. Only by thinking more and reflecting more can they learn math well.