Math Problems Decimal Point 3rd grade math problems about decimal points

140 square centimeters = square decimeters 785 meters = kilometers.

23 dm = m 90 kg = ton.

60 grams = kilograms 760 mm = meters.

320 cm = 32 dm = m.

2.100 bags of laundry detergent weigh kilograms, so how many kilograms does 1000 bags of such laundry detergent weigh?

bag) A: 1000 bags of such laundry detergent weigh kilograms.

3.When Xiao Hua calculated and divided by a certain number, the preliminary result was that when he checked the calculation, he found that he had pointed the decimal point of the quotient to the left by one wrong place. Q: What is the divisor?

A: The divisor is.

1 You won't.

I won't. 1 140 square centimeters is equal to (square decimeters) 785 meters is equal to (km.

23 decimeters are equal to (m 90 kg is equal to (ton.

60 grams is equal to (kilograms) 760 millimeters is equal to (m.)

320 centimeters is equal to (32) decimeters are equal to (meters.

Not counts, because.

0 is omitted.

So it doesn't count. Analysis: 0 because it cannot be placed first and last.

So. It has to be.

Or is the format.

First of all. Not counted.

0 is omitted.

I forgot the format on the + just now.

Analysis: Because 0 can't be put at the end.

Or it can be separated from the decimal point and put first, so the format is:

No, there can't be 0 in front of the number

1. A number with more decimal places is larger than a number with fewer decimal places?

Answer: False, for example, is the large with fewer decimal places.

2. There are only 9 decimals greater than 5 and less than 6?

Answer: False, I didn't guess how many digits after the decimal point were wide, so there were infinite ones. Like what.

3. What is the original number after the decimal point of a certain pi bright number is moved to the left by one place, which is smaller than the original number?

Answer: The original number is that moving the decimal point to the left by one place to the left is a 10-fold reduction.

The knowledge points of the decimal point are as follows:

1. The meaning of decimals: divide a whole into 10 parts, 100 parts, 1000 parts, ......Such a few copies are a few tenths, a few hundredths, a few thousandths ......It can be expressed as a decimal. One decimal place means a few tenths, two decimal places indicate a few hundredths, and a three-digit decimal place indicates a few thousandths of a year.

2. The method of comparing the size of decimals: first compare the integer part, and then compare the tenths, percentiles, and thousandths one by one.

3. Decimal point alignment, addition and subtraction of the same digits. And multiplication is the rightmost alignment. Therefore, the counterpoint of decimal addition and subtraction must be distinguished from multiplication.

Infinitesimal decimals are converted into fractions.

If it is a pure cycle: the number of digits of the loop section, write 9 with the same number on the denominator, and write the loop section directly on the peizi: for example: 0 343434......＝34／99。

If it is a mixed cycle: for the number of looping sections, write 9 with the same upper digit on the denominator, and write 0 equal to the number of non-cyclic digits directly after 9 for the non-cyclic part; The number of molecules consisting of non-cyclic fractions and cyclic segments minus non-cyclic fractions, such as: 012656565......＝1265－12／9900＝1253／9900。

Before the decimal point was introduced in China, Chinese had a set of decimal units to represent decimal places: minute, cent, milli, silk, flicker, micro, fiber, etc., and each unit was one-tenth of the previous one. For example, it is read as "three and one minute four millimeters and six wires" or "three and one points and four centimeters and six millimeters and six wires".

After the decimal point was introduced to China from the West, the decimal unit has gradually been used except for the translation of decimal prefixes, and is still used for interest rates.

If the wrong number is 10x, the correct number is x

10x-x=

9x=x=A: The correct number is.

Hope it helps.

The little sloppy dotted the decimal point by one wrong place, and the known correct is less than the wrong one, what is the correct number?

Solution: Let the correct number be x and the wrong number be 10x

10x-x=

9x=x=x=Hope it helps!

If the correct number is the wrong sum, the decimal point is one place down.

The difference between the wrong digits is 10 times, i.e. the wrong number is 10 of the correct number. This way we know that there are 9 times less right than wrong.

As the question suggests: There are fewer correct than wrong.

There are 9 times less right than wrong.

That is, 9 times corresponding.

This makes it possible to find a multiple, which is the correct number:

Solution: Let the correct number be x and the wrong number be 10x

10x-x=

9x=x=x=Hope it helps!

Analysis: Set the wrong number to 10x, and the correct number to x10x-x=

So 9x=so x=

If the wrong number is 10x, the correct number is x

10x-x=

9x=x=

Let the number of errors be x

Because there are fewer right than wrong.

So the correct number is.

Column equations. The solution is x=

i.e. the wrong number is.

The correct number is.

Benzene! Solution: Let the correct number be x and the wrong number be 10x

10x-x=

9x=x=x=

You can start by assuming that the correct number is x, because the wrong number is greater than the correct number, so the misplaced number is 10 times x, and then you can establish the equation 10x-x= to get x=

,,, know this, but 524 doesn't.??

Set the original price of the wrong item and the normal item.

--It can be seen that it is impossible to pay a certain amount of money, so d = 0, return to the first formula, then h=0, and then return to the second formula, then c = 0, and then return to the first formula, then g = 0, and then go back to the second formula, then b = 5, and then return to the first formula, then f=3, and then return to the second formula, then a=2, e=4. One is $25 and the other is $43.

Method two, let the former be x, the latter is y, because of the large coping, so the former is small, the decimal point is shifted to the left, the size is the original 1 10Rule.

x+y=68

x 10 + y = gives x = 25 and y = 43

The price of one of the products is $x, x=25

Let these two things be $ x and $ y.

Suppose the misread decimal point is x, and the misread is.

then x+y=68

x=25 y=43

** = 10 9 ( another ** = 68-25 = 43

Suppose you see that the item is $x, and the item is $y, then there is:

x+y=68

It's just that the decimal point is wrong, and Xiaohua paid less than she actually had to pay, so she paid 1 10 payable, and there was:

x/10+y=

Subtract the two formulas and have, x-x 10=

9*x/10 =

x=25y=68-x

y=43

Because the decimal point is wrongly paid less than the actual payable, so the ** is small.

x+y/10=

x+y=68

So y=25 x=43

The decimal is:

The decimal place that does not change in size is:

[xiǎo shǔ diǎn]

Decimal point (mathematical symbol).

decimal point, mathematical symbols, writing"." is used to separate integer and decimal parts in the decimal system. The decimal point, although small, is very useful.

We must not ignore this small symbol at any time. Because of this inconspicuous mistake, mankind has caused one tragedy after another. It can be said that "the difference is a millimeter, and the error is a thousand miles".

1.A is 100 times that of B, and if you move the decimal point of B to the left by two places, what is the number of A?

2.A is 3 less than B, and after the decimal point of A is shifted to the left by one place, what is the original number of A and B?

3.What is the actual area of a square of land when the actual side length is reduced to 30 decimeters per hundredth of the original number?

4.Shift the decimal point of the ton to the left by two places, and the original number of ( ) is reduced by ( ) kilograms.

5.Shifting the decimal point of the ton to the right by one place expands to ( ) times the original number, increases ( ) kilograms, and increases ( ) times the original number.

Adding ( ) meters to one meter equals 1 meter.

Adding ( ) meters to one meter equals 1 meter.

8.If the decimal point of a certain number is shifted to the right by one place, the new number obtained is 18 times greater than the original number, what is the original number?

This practice problem is very easy to get Ah, use excel** to take decimal random numbers, random addition, subtraction, multiplication and division can be done Infinite questions will not be able to ask Leave an email to write and send it to you.