What math problems can be solved with a ruler for elementary school students

Also known as an in-room ruler, the ruler has a precise straight edge and is used to measure length and make graphs. It is widely used in mathematics, surveying, engineering and other disciplines.

Rulers are widely used in mathematics, surveying, engineering and other disciplines. Ruler gauge with precise straight edges. The straightedge is used for straightness measurement and flatness measurement using the gap method, and can also be used in conjunction with a gauge block to inspect length dimensions.

In order to use the light gap method to check the height of the boss of the workpiece. Before measuring, two sets of dimensions are formed with measuring blocks, one group is equal to the maximum limit size of the boss height dimension tolerance, and the other group is equal to the minimum limit size. If the former is used, the contact between the edge of the ruler and the surface of the boss transmits light; When the latter is used, the contact between the edge of the ruler and the measuring surface of the gauge block transmits light, which means that the height and size of the boss are qualified.

The straightedge, commonly used in rolling bearing steel, is a very commonly used instrument for measuring length, and this kind of stationery is so common that almost every elementary school student has one, and is usually used to measure short distances or draw straight lines.

The materials are different, there are iron, wood, plastic, etc., and the ruler has a certain hardness, otherwise it is a soft ruler. The minimum scale is generally 1 mm. The scale unit is usually centimeters.

The length is commonly 1 meter ruler and 15 cm short ruler, but there is no actual limit, so the length ranges from one centimeter to four or five meters.

There are two types of tick marks: the top end (which is the beginning of the ruler) and the non-top end (there is a blank space in front of the mark, about 1 cm). The maximum error is usually no more than a millimeter.

The maximum error of the specification is mm, the maximum error is mm, the maximum error is mm, the maximum error is mm, the maximum error is mm, and the maximum error is mm.

You can use a ruler to do some simple measurements, such as the length of a table, the length of three fingers.

You can do some simple calculations, such as the area of the rectangle, the perimeter, etc.

1.You can look at the scale above and recognize millimeters, centimeters, and decimeters. 2.Measure the length of the object. 3.Mapping and so on.

A ruler for elementary school students can measure the length, width, and thickness of an object.

Line drawing, measurements, and more.

1. Recognize the range of the scale (i.e., the measurement range), the graduation value (that is, the value represented by the minimum scale) and the zero scale mark (the scale with zero scale line wear can be measured from a whole scale line that can be seen clearly).

2. Align the zero scale mark or a certain numerical scale mark to the beginning of the object to be measured, so that the edge of the scale ruler is close to the object to be measured, parallel to the measured length, and cannot be tilted.

3. The line of sight is perpendicular to the scale surface of the scale or directly opposite the scale mark.

4. When reading, it is necessary to estimate the next digit of the graduation value.

5. Record numbers (including accurate values and estimated readings) and units.

6. In the actual measurement, it is not that the smaller the graduation value, the better, and the measurement should first determine the degree that needs to be achieved according to the actual situation, and then choose the scale that meets the measurement requirements.

Measure from the zero tick mark, and the degree is read directly above the value to avoid errors.

When estimating, pay attention to the value of the last digit, whether it is plus one or subtract one.

Start the measurement from the zero scale mark, try to keep the object to be measured close to the scale mark of the ruler, and the line of sight should be perpendicular to the ruler when reading.

Attention, attention.

11-6 The math problems that can be solved can be mainly guided by specific examples.

For example: 1. The elder brother is 11 years old this year, the younger brother is 6 years old, how old is the elder brother than the younger brother?

2. The elder brother has 11 books, the younger brother has 6 books, how many books does the elder brother have more than the younger brother?

3. Book A sells for 11 yuan, Book B sells for 6 yuan, how much more expensive is A than B?

Eleven people are in a room, six are dead, the rest are not dead, how many are left who are not dead?

A family of three, each with three apples, asked the family how many apples there were.

Requires unlimited rounds of consulting services.

Ask those 28 questions.

It's long, but it's not that difficult.

Which formula won't?

2/3 power of 27?

27 is equal to 3 to the third power.

Multiply top 3.

That's it, just ask.

Can you write out the answer and take a picture of me.

Need to buy 6 more rounds of service.

Click on my avatar to select.

1) There are 25 baby monkeys. （20+5）÷（5-4）=25

2) A hits first, B second, and C last. The reason is that the last person must wait and turn on the water for 6 minutes, so the time for the first and second people is the shortest.

A hits first, it takes 1 minute; B second hit, wait and turn on the water takes 3 minutes. The time is the shortest.

3) Unclear.

Monkey x pcs. 4x+20

5x-54x+20=5x-5

Then do the math yourself.

Question 1: If there are x monkeys, then, 4x+4=5x-5 x=9

Second, third, did not think.

1.Set up x monkeys, a total of y peaches.

y-4x=2

y-5x=-5

2.How come it doesn't say how many taps there are?

Question 3 is not sure.

Question 1 Set monkey x peach y y=4x+1 y=5x-5 solve x=9 Question 2 I don't know Question 3 first fry 2 pieces, take 1 piece and then put 1 piece, that one piece will be fried, put it in, and take it out after frying, because both will be good, so it will be 1 point faster, and the other 3 will do the same 4*4+4*4=32

There are 4 sets of desks and chairs in each row in the classroom, and there are 3 rows, how many sets of desks and chairs are placed in the classroom?

3 4 = 12 (sets).

A: There are 12 sets of desks and chairs in the classroom.