The 5th grade math short term problem Off Sheet has an answer 10

Just use this (the one upstairs, don't copy other people's)!!

If you don't have an answer, use a calculator to do the math.

One:13 7 49 9 - 4 3 II: 1

2．15 5x-2x=18

3．3x+4．2x+10

3－ 5x＝80

6x＝54＋4x ＝40

Calculate 50 equations out of the equation, and you can pick and choose 30 equations.

Easy for 5th gradeOff-line calculationsAnd the answers are as follows:

Analysis: This problem uses the commutative associative law of addition, and then calculates it after rounding. The steps are as follows:

Analysis: In this problem, we first use the additive distributive property, convert 27 into (26 1), and then use the multiplicative associative property.

This makes the operation easy.

17 and 17 26

Analysis: Using the rounding method and the subtraction associativity law calculation, first use the rounding method to transform 99 into (100-1), and then use a-b-c=a-(b+c) to calculate it simply. The steps are as follows:

Analysis: Use the extraction of common factors.

The formula: ac+ab=a(b+c), extract the common factor, and add it to make up the whole number, making the operation easy.

Off-line calculationsAlso known as recursive equation calculation, remember to write the equal sign in front of the equation and calculate step by step according to the rules of operation.

This method actually uses the multiplicative distributive property.

The same factor is extracted, and the remaining items in the exam are often added and subtracted, and a whole number will appear. For example:

TeaseEasy to calculateThe most commonly used method is the multiplicative distributive property.

Multiplicative distributive property: ax(b+c) = axb+axc, where a, b, c are arbitrary real ruler worlds.

On the contrary, axb+axc=ax(b+c) is called the inverse application of the multiplicative distributive law (also called extracting the common divisor, especially when a and b are complements each other, this method is more useful, and sometimes the addition associative law is used, such as a+b+c, b and c are complements to each other, you can combine b and c, and then multiply with a, such as changing the + in the above equation to x, and using the multiplication combination law can also be easily calculated.

The main thing to learn is to remember to calculate multiplication and division first, and then add and subtract. In the case of multiplication and division, the calculation is performed in order from left to right. When you encounter parentheses, you want to first calculate the inside of the parentheses.

In the process of detachment, the line of the order of operation should be drawn according to the order of operation, and the "three checks" should be achieved

First, it is necessary to check whether the numbers and symbols copied from the book to the workbook are correct.

Second, it is necessary to check whether the numbers and symbols from horizontal copying to draft vertical copying are correct.

Third, it is necessary to check whether the number of the draft is copied vertically, whether it is copied correctly on the horizontal type, whether the decimal point is in the right place, and whether there is any omission.

There are a lot of them, as long as you think of them, you have to make sure that they can be counted!!

彡彡彡彡。

What makes life better! Just write it yourself.

Analysis: This problem uses the commutative associative law of addition, and then calculates it after rounding. The steps are as follows:

Analysis: In this problem, we first use the addition distributive property, convert 27 into (26 1), and then use the multiplicative associative law to make the operation easy.

17 and 17 26

Analysis: Using the rounding method and the rent reduction method combined with the law and disadvantages, first use the rounding method to transform 99 into (100-1), and then use a-b-c=a-(b+c) to calculate it simply, and the steps are as follows:

Analysis: Using the method of extracting the common factor, the formula: ac+ab=a(b+c), extracting the common factor, and adding it to make up the whole number, making the operation simple.

Grade 5 Off-Sheet Calculation Skills: From left to right, multiplication and division first, then addition and subtraction; In the multiplication and division calculation, it should be calculated in order from the left to the right; When you encounter parentheses, you want to first calculate the inside of the parentheses.

Primary 1 to 6 Mathematics focuses on basic calculations and a preliminary understanding of geometric algebra. Basic concepts in numbers and algebra, such as numbers, natural numbers, positive numbers, negative numbers, etc.; Basic concepts of graphics and geometry, such as angles, fixed points of angles, edges of angles, triangles, quadrilaterals, etc.

Primary 1: 99 multiplication formula, learn the basics of addition, subtraction and multiplication: memorize the 99 multiplication formula, so that you are familiar with the multiplication of single digits;

Primary 2: Improve the multiplication formula, strengthen the knowledge of the first grade, learn to divide the mixed operation, and basic geometric figures;

Primary 3: Learn the commutative law of multiplication, geometric area, circumference, etc., the amount of time and units. distance calculation, distributive property, fractional decimals;

Primary 4: Line angles, natural numbers, integers, prime factors, trapezoidal symmetry, fractional decimal calculation;

Primary 5: Multiplication and division of fractional decimal answers, algebraic equations and averages, comparative size transformations, graph area volumes;

Primary 6: Proportional Percentage Probability, Fan Cylinder and Cone.

The simple calculation method for the fifth grade is briefly described as follows:

1. When the two numbers A and B are multiplied at the same time or the same number C, and then added or subtracted, you can first add or subtract the two macro numbers of A and B, and then multiply and divide with C to calculate, as follows:

2. In addition, subtraction, multiplication and division, when the non-nuclear case conditions are discussed, that is, when the four natural numbers of ABCD are not regular, the chain book is carried out, and the addition, subtraction, multiplication and division should be carried out first (first calculate a b and c d), and finally add and subtract the operation, as follows:

3. Between the large, medium and minor parentheses of the operation symbol and the addition and subtraction of multiplication, first calculate the number in the small parentheses in the brackets, then calculate the number in the brackets, and finally multiply, divide, add and subtract the numbers outside the brackets, as follows:

a＋b）＋ c = a ＋（b＋c）

a－b－c = a －（b＋c）

a × b）×c = a ×（b × c）c ×（a+b）= ca ＋ cb

a b c = a b c) vertical calculation:

A total of 1440 items.

Oral arithmetic problems. Calculation questions.

Those with parentheses are counted in parentheses first, and those without parentheses are counted first for multiplication and division, and only those with parentheses or additions and subtractions are calculated in order.

Or use a simple algorithm and spread the brackets first.