The third grade of mathematics in Zhejiang Education Press? Next? Always reviewing? One? 1, the three-digit divisor is a two-digit number? Look at the top two first? You two are not enough to see the third place? Except which company to go to. Who is it? If it's not enough, then it's business? The remainder is less than the divisor 2. Unit price, quantity, total price × quantity = total price ÷ quantity = unit price ÷ unit price = quantity 3, speed, time and distance = speed × time speed = distance ÷ time = distance ÷ speed 4. Work efficiency, working hours and total amount of work = work efficiency × working hours. There are two basic types of standardization problems. One is positive normalization. Like what? A car travels for 3 hours 150 km? Like this? How many kilometers in 7 hours? One is anti-normalization? . Like what? Road repair team 6 hours road repair 180 km? Like this? How many hours does it take to build a 240 km road? What are the similarities between positive normalization and negative normalization? Generally speaking, the first step is to find a single quantity? The difference is in the second step. The problem of normalization is to find out what a single quantity is. Regression one is to find out how many units are included. 6. Application question 2? The problem of induction is similar to that of standardization. Is it induction? The problem of normalization is to find "single quantity" And the question is to find out the "total"? Then get the result according to other conditions. When solving the problem? You have to figure out the "total amount" first, right? Then solve the problem according to other conditions? It's called the general question. The so-called "total" refers to the total price of goods and how many hours? How many days? Total workload, total output of several acres of land, total distance of several hours, etc. Quantity relation 1 number of copies × number of copies? Total amount ÷ 1 copy? Total number of copies ÷ another number? Another idea and method to solve the problem of each quantity is to calculate the total quantity first? Then get the required number according to the meaning of the question. 7.24-hour timing method. Ordinary time method 24-hour time method 8. Time unit year, month and day? Century = 100 = the fourth quarter of =65438+ February of =365 days? Pingnian? One year =366 days? Leap year? The first quarter =3 months, and one month = 30 days? Upper, middle and lower? One month =30 days? Abortion? One month =3 1 day? Da Yue? Week = 7 days a day = one hour, 24 hours = one minute, 60 minutes =60 seconds. What is the big month of the year? January, March, May, July, August, October and December? Seven months? A little moon a year? April, June, September and November? Four months? Judge a normal year and a leap year? Method? A leap every four years? Never leap in a hundred years? Another leap in 400 years. Like what? 1968- leap year? 1954- Pingnian? 1900- normal year? 2000-leap year. How to judge? If the last digit of the year is odd 1, 3, 5, 7, 9, it must be a normal year. Does the last digit of 20 1 1 and 1985 need further judgment? There are two relatively simple methods 1? See if the last two digits are divisible by 4. Like what? 1928? The last two digits are 28÷4=7, so it is a leap year? Another example? 19 18? The last two digits are 18÷4=42, so it is a normal year. ? 2? Remember that 2000 is a leap year. Use the year that needs to be judged to get the difference? Like what? 1996,2000-1996 = 4, can 4 be divisible by 4? Is a multiple of 4, so it's a leap year? Another example? 20 16? 20 16-2000 = 16, can 16 be divisible by 4? It is a multiple of 4, so it is a leap year. 9. The average question generally contains two meanings? (1) refers to several unequal numbers? In the case of the same? Move more and make up less? Big goods for small goods? Make each copy equal? (2) refers to the total is divided into several equal parts. What are the concepts involved in the average problem: total number, total number of copies and average number? 1 What is the basic formula for solving the average problem? Total number ÷ Total number of copies = average? 1 serving? Total number ÷ average number = total number of copies × total number of copies = total number The key to answering such questions is to find out the relationship among total number, total number of copies and average number? By total number of copies? Find one? This is the average. For example? 1, a small snail climbs in 6 minutes 12 decimeter? How many meters did it crawl at the speed of 1 hour? The school bought some football and basketball. It is known that three footballs and five basketballs cost 28 1 yuan. Three footballs and seven basketballs cost 355 yuan. How much does it cost to buy five footballs and four basketballs now? 3. Does Xiaohua read 24 pages a day? /kloc-finished reading the book Red Rock in 0/2 days. Xiao Ming reads 36 pages a day? How many days can I finish watching Hongyan? 4. The garment factory originally made a set of 30-decimeter clothes cloth? After improving the cutting method? 20 decimetres of fabric for each suit. Fabric used to make 80 suits? How many sets can you make now? 1.A There are 98 workers in the workshop? There are 120 workers in workshop b? C and d workshop workers 166 people? How many people are there in workshops A, B, C and D? Do you have 5 kilograms of fruit candy? 2.4 yuan per kilogram? Four kilos of toffee? 3.2 yuan per kilogram? Soft candy 1 1 kg? 4.2 yuan per kilogram. Mix these sugars into assorted sweets? How much is this assorted candy per kilogram? 3. What was Xiao Ming's mid-term exam score? The average score of Chinese and English is 96? Math score 93? What is Xiao Ming's average score in Chinese, English and mathematics? 4. The average score of Xiao Wang's four language tests is 92? The average score of five tests is 93? How many points did Xiao Wang get in the fifth exam? 5. It is known that the sum of eight consecutive odd numbers is 128? What are these eight numbers? 1, counting weeks. Like what? 2011121is Thursday? What day is 65438+February 24th? Write a calendar. ? 2? Periodic problem. 2. Knowledge related to "time"? 1? 12 and 24: 00. Like what? 5pm = 17am 1 1:30am = 1 1:30am 8？ 00= 8:00 p.m. 8: 02 p.m. = 20: 02 p.m. Note 1? 12 has a modifier in the timing method. ? Morning, morning, noon, afternoon, evening? ? 2? When the minute is less than 10 minute, write 0. Like 8: 07 or 8:07. 2. Calculate the elapsed time. Method? Use vertical calculation time. ? Borrow 60? Like what? 8: 00 a. m. 30: 00 to noon 12? 00? How long did it take? At 12? 8: 30 =3: 30+02: 00? 1 1: 60，8: 30，3: 30？ After half past three. Pay attention to 1? The formula of time? Regardless of the landscape? Can't you write a spreadsheet? Write in words. ? 2? If you calculate the elapsed time from a certain time in the morning to a certain time in the afternoon? Do you want to change the afternoon time to 24: 00 first? Then calculate. Like what? How long did it take from 9 am to 6: 50 pm? 6: 50 pm =18: 5018: 50? 9: 00 =9: 50? After nine fifty. ? 3? What if the elapsed time is counted every other day? I'll forget it in two days. Like what? Xiaohong went to bed at 9: 30 last night? Get up at six this morning? How long did you sleep? At 12? 9: 30 =2: 30, 2: 30? 6: 00 =8: 30? Xiaohong went to bed at 8: 30. 3. Overall planning. Like what? What will Aunt Zhang do at the weekend? Washing clothes? Washing machine? 30 points? Wipe the table 10? Sweep the floor 10? Hang clothes 10? Cut the fruit into 8 points. How long will it take her at least to finish everything?