1 ... Two granaries A and B stored 320 tons of grain. Later, warehouse A shipped out 40 tons and warehouse B shipped out 20 tons. At this time, the grain storage of warehouse A was twice that of warehouse B. How many tons was each grain storage?
2. There are 560 students in a school, and 40 boys are three times less than girls. How many boys and girls are there?
The school bought four footballs and two volleyballs and spent 162 yuan. Each football is more expensive than each volleyball, 3 yuan. How much is football and volleyball each?
4. Nanjing Yangtze River Bridge is 4570 meters longer than new york Bridge in the United States, and new york Bridge is 530 meters longer than Wuhan Yangtze River Bridge in China. It is known that the length of three bridges is10640m. How long are these bridges?
There are 400 pears in basket A and 240 pears in basket B. Now, take out the same number of pears from the two baskets, and the number of pears left in basket A is exactly five times that of basket B. How many pears are left in basket A and basket B?
The sum multiple problem refers to the operation of finding their sum, difference, product, quotient and n times of their sum given two integers A and B. To calculate the sum of two integers A and B, just add them: sum = a+b, and to calculate the difference between two integers A and B, just subtract the second number from the first number: difference = a-b.
1. n times the sum of two integers.
To calculate n times the sum of two integers A and B, just find their sum first, and then multiply it by n times of n: sum = (a+b) * n.
2. Why do you want to study multiplication?
Learning multiplication problems can help children master basic mathematical operation rules and cultivate their logical thinking ability and problem-solving ability. At the same time, the problems of addition and multiplication are mastered, which lays a solid foundation for more complicated mathematical operations in the future.
3. How to use multiplication to do the problem?
Summation and multiplication are common problems in mathematics and are widely used in real life. For example, to calculate the price, discount and total amount of goods when shopping, you need to apply the knowledge of doubling. In addition, when solving specific practical problems, it is often necessary to use the sum and multiple problem to derive the solution.