How to cross the river in elementary school? How to cross the river in elementary school math proble

The topic of this elementary school embankment crossing should be continuous addition and subtraction. In other words, it is enough to calculate the answer of the previous one with the next one. When he steps on the second stone, it should be the previous 7 minus 3, then you can fill in the 4 on top of the stone.

Do this continuously, filling in every stone.

This is actually the addition and subtraction of the numbers written on the stones that cross the river, along with the operation symbols, to be calculated in order from left to right.

The same is true at the bottom of the diagram.

The number above the boy got after crossing the river is: 10. The number the boy got after crossing the river below was: 6. Step +6=10 for the top step and -4=6 for the bottom step

In the question of ducks crossing the river in elementary school, there is a group of ducks with white color, eight black fans, and three gray fans. The answer is 8 + 3 plus 3 = 14.

This kind of elementary school crossing the river is a mathematical addition and subtraction problem, and the number of steps is calculated step by step, and the result is finally added.

This question is a continuous calculation:

10-6+3-2+4-5+6

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This kind of problem should be in the second grade, right.,There should be an equals sign between every two numbers.,Write a result after each equal-sign.,Then you can calculate it down.,I hope it can help you.。

The number above the boy got after crossing the river is: 10.

The number the boy got after crossing the river below was: 6.

Step +6=10 for the river crossing above

The following steps to cross the river are -4=6

Analysis] This question examines the knowledge points related to the mixed operation of integer addition and subtraction.

Addition and subtraction within 10 should be kept in mind: "9 to 1", "8 to 2", "7 to 3", "6 to 4", "5 to 5" The method of making up ten is simple and easy, and the thinking process has "one look (see the big number), two split (split the decimal number), three make up the ten, and add the remaining number" Look at the big number, divide the decimals, make up ten, and add the remaining number.

Let the kitten and rabbit cross the river together, the kitten stays, the rabbit returns, and then all the animals cross the river in turn.

Because the rabbit needs the least time, the rabbit is the "boatman", the rabbit takes three small animals to cross the river and come back twice, the rabbit is equivalent to walking five one-way, and the rest of the animals are one-way. The time is 1*5+2+5+10=22

Every time the two have to come back, this one is a waste, naturally use the smallest rabbit to be the most cost-effective, the rabbit holds the boat one by one, and the rest is carried over.

If the weight is added up, the other three animals are all one-way, which takes 2 + 5 + 10 = 17 minutes.

Rabbit 3: The outbound journey and the return journey are 5 minutes in total.

22 minutes together.

The details are as follows. Bunny + Kitten 3 minutes away.

Bunny 1 minute return.

Rabbit + Lamb 6 minutes.

Bunny 1 minute return.

Bunny + Piglet 11 minutes.

A: Rabbits cross the river the fastest, so every time a rabbit crosses the river with other animals, it saves the most time.

Your question stem is partially blocked ......

It is a continuous calculation, e.g., 10-6=4

The number above the boy got after crossing the river is: 10.

The number the boy got after crossing the river below was: 6.

Step +6=10 for the river crossing above

The following steps to cross the river are -4=6

Grade 1 math thinking expansion, boat crossing the river, let children know that the boat can not be driven by no one.

Just count it. He just adds and subtracts as much as he can figure out the number.