Primary 3 math questions, what is the method of math 3rd grade questioning

Weight of a bag of salt: (1100-860) (5-3) 120

Weight of a bag of sugar: 860-120 3 500

Salt: 1100-860 = 240 (grams).

5-2=3 (bag).

240 divided by 2 = 120 (grams).

Sugar: 120 times 3 = 360 (grams).

860-360 = 500 (grams).

A: A bag of salt weighs 120 grams and a bag of sugar weighs 500 grams.

Solution: Set a bag of sugar for x grams and a bag of salt for y grams.

x+3y+240=x+5y

2y=240

y=120860-3 120=500 (grams) Answer: 500 grams of sugar in a bag, 120 grams of salt in a bag.

Elect me as !!

Divide the information into equations: one bag of sugar + three bags of salt = 860 grams One bag of sugar + five bags of salt = 1100 grams Then, (one bag of sugar + five bags of salt) - (one bag of sugar + three bags of salt) = two bags of salt, that is: 1100-860 = 240 grams ......The weight of two bags of saltThe weight of one bag of salt:

240 2 = 120 grams.

There are two ways to find a bag of sugar: -120 3=500 grams -120 5=500 gramsAnswer: A bag of salt weighs 120 grams, and a bag of sugar weighs 500 grams.

Salt, 120 grams per bag, sugar 500 grams per bag.

There is a question that knows that two bags of salt weigh 1100-860 = 240 grams, so one bag of salt weighs 240 divided by 2 = 120 grams.

So a bag of sugar weighs 860-120*3=500 grams.

Hope you're satisfied.

Everyone is right.

Because one bag of sugar with three bags of salt is lighter (1100-860) grams than one bag of sugar with five bags of salt. And 2 bags of salt less.

So (1100-860) is the weight of two bags of salt. A bag of salt is 120 grams, bring 120 grams of salt into a bag of sugar, add three bags of salt, weigh 860 grams, and get:

860-3 120 = 500 grams.

So sugar is 500 grams.

Salt, 120 grams per bag, sugar 500 grams per bag.

1100-860 = weight of two bags of salt = 240 grams.

Then the weight of a bag of salt is 120 grams.

The weight of a bag of sugar is 860-3*120=500 grams.

So a bag of salt weighs 240 divided by 2 = 120 grams.

So a bag of sugar weighs 860-120*3=500 grams.

1100-860 = 240 (grams).

240 2 = 120 grams.

120 3 = 360 (grams).

860-360 = 500 (grams).

A: A bag of salt has 120 grams and a bag of sugar has 500 grams.

In comparison, there is a difference of two bags of salt between the two cases, so the weight of salt is (1100-860) 2=120 (grams).

Sugar is 860-120*3=500 (grams).

1100-860 = 240 kg (extra 2 bags of salt) 240 divided by 2 = 120 grams (per bag of salt) 860-120 times 3 = 400 grams (per bag of sugar).

Salt: 120 grams per bag. Sugar: 500 grams per bag.

1100-860 = 240 (grams).

240 2 = 120 grams.

120 3 = 360 (grams).

860-360 = 500 (grams).

Use 1100 grams of one bag of sugar and five bags of salt to subtract 860 grams of one bag of sugar and three bags of salt, then there are still 2 bags of salt left, and then divide by two. The equation is (1100-860) divided by 2=120 (grams).

A bag of salt is 120 grams, and a bag of sugar is calculated.

860-3 120 = 500 grams.

So a bag of salt is 120 grams, and a bag of sugar is 500 grams.

Salt, 120 grams per bag, sugar 500 grams per bag.

There is a title that knows that two bags of salt weigh 1100-860 = 240 grams.

So a bag of salt weighs 240 divided by 2 = 120 grams.

So a bag of sugar weighs 860-120*3=500 grams.

Hope you're satisfied.

Column equations. Take a bag of sugar for x grams and a bag of salt for (840-x) 3 grams.

It is also possible to set the salt as y grams, because it is considered to be in the third grade, so it is easier to solve the unary equation) column equation x+5*(840-x) 3=1100 to solve x.Add it up.

Salt (1100 860) (5 3) 120 (kg).

Sugar 860 120 3 500 (kg).

A: A bag of salt weighs 120 kilograms, and a bag of sugar weighs 500 kilograms.

120 (grams).

500 (grams).

A: 120 grams of salt in one bag and 500 grams of sugar in one bag.

Summary. Hello, the questioning method in Mathematics 3 is to ask clever questions and guide students to draw inferences. Ask questions in simple terms, making it easy. Design open-ended questions to expand innovation. <>

Hello, the questioning method of the third grade of mathematics is: clever questioning, guide the student to draw inferences. Ask questions to hold regrets and go deep into the rotten Pi Kai, and turn the difficult into easy. Design open-ended questions to expand innovation. <>

Related Sun Vertical Limb Information: In order to guide students' positive thinking when asking questions, only clear and specific questions can point out the direction of students' thinking. Otherwise, it will mislead students and fail to achieve the preset effect of asking questions.

The questioning method refers to the teaching method in which students independently improve a teaching conclusion through the questioning of the old teacher. This method helps students to understand the mathematical nature of the conclusion, to clarify the necessity of each condition in the conclusion, so that the conclusion can be used correctly and flexibly.

This is a third-grade math, that is, through **small tricks** to learn to ask questions, today's question is used; What is Dan Xun, ask. I need to model this demolition, and I want you to give an example. For example, he gave an example of liquid, we often use ml to measure, what is ml?

We know that L stands for liter, but what is M? We are not understandable as milli. I want you to give me an example.

Hello, for example: ask what kg is with an item? kg is kilogram. <>

Is that so? <>

For example, what do you mean by the phrase "6 more students in other grades than 4 times the number of students in 2nd grade"? 4 times more digging the tomb is to judge Qi four times his plus 6 people. Is that so. <>

Buy 4 get 1 free

Buy and give.

Buy and give.

Buy and give.

44 (4 3) = 44 12 = 520 (yuan), that is, you can buy 5 for 4 balls.

Column Composite Formula:

520 (yuan).

A total of three times to buy four balls, 396 yuan, plus three to give, is equal to 15 balls.

A total of 12 basketballs were bought, 3 basketballs were delivered, 44 12 528

Liu Yin's family has 200 sheep, including 125 black sheep and 146 ewes.

Solution: There are 146 ewes, then there are 200-146 = 54 rams, and the rams are all black, so the number of black ewes = 125-54 = 71 (ewes).

A total of 1,235 people in Wuchi Village have the right to vote, and in a village head election, there are only two electors, A and B, of which 591 voted for A, and 96 people think that both voters are not good enough and give up voting.

Number of votes for B = 1235-96-591 = 548 (votes) < 591 (votes), so A is elected.

Calculate first, and then change the question according to the requirements.

1.Changed a number to a three-digit difference.

Change the number 8, which has been subtracted by thousands of digits, to 4

2.Change one more number so that the difference is two digits.

Change the number 8 to 9 by a few hundred digits

1. There are 71 black ewes, and there are x black ewes, because there are 125 black sheep, and except for the black ewes, the rest are all black rams, so there are 125-x black rams.

If all the rams are known to be black, the number of rams is 125-x black rams. There are 200 all rams plus all ewes, so there is 146+(125-x)=200, and x=71 is solved.

2. If A is elected, what is sought is the number of votes obtained by B, and then the number of votes obtained by A and B is compared, and the one with the highest number of votes is elected.

A total of 1,235 people are known, and 96 people abstain, so there are a total of 1,235-96 = 1,139 valid votes.

Because A has 591 votes and another person cannot vote for 2 people at the same time, B gets 1139-591 = 548 votes.

591>548, so A was elected.

3. (1) If it is not changed, the difference is 4135 with four digits, so if the difference becomes a three-digit number, it can only be changed by 1,000 digits.

So it can be 8000-7865 or 4000-3865

2) If it is 8000-7865, it is necessary to change the 100 digits to 8000-7965;

If it is 4000-3865, it becomes 4000-3965.

ps: If you consider negative numbers in the third question, you can get the answer in the same way, I hope it can help you.

2.B has a vote: 1235-591-96 So A candidate was elected.

…Because 09 is a normal year, 367-365 = 2 (only), so there are at most 3 white rabbits born in one day, and there are 31 days in December, 63 21 = 3 (only), so at least 3 gray rabbits are born in one day.

In 2009, there were 365 days, if 1 white rabbit was born every day, then there were 367-365 = 2 white rabbits, and these 2 white rabbits could be born on any day of the 365 days, so at least 2 white rabbits in Uncle Zhang's family were born on the same day, and at most 367 were born on the same day (although it is not realistic).

There are 31 days in December, and according to the previous method, at least 63 21 = 3 gray rabbits are born on the same day.

Estimate: 402 is approximately equal to 400

98 is approximately equal to 100

The final answer is 304

400-100 Each number is reduced to an integer.

The number of ways to match the number of tops The number of bottoms.

Number of coordinates = number of tops x number of bottoms.

Hello! We'll be happy to answer for you.

Hello, 68 can be greater than or equal to can be approximately equal to 20. So the answer is 70 20 1400m. Hope it helps, thank you.