add
1.2+3=
2.4+ 1=
3.5+2=
4.3+4=
5. 1+8=
6.7+2=
7.9+ 1=
8.6+3=
9.8+2=
10.5+5=
Addition is one of the most basic operations in mathematics. Let's look at the calculation method of addition.
Calculation method of addition:
For example: 2+3=?
1. Add the single digits of 2 and 3 to get 5.
2. If the decimal digits of the two numbers are not 0, add the decimal digits of the two numbers, and then add the numbers obtained in the previous step to get the final result.
subtraction
1 1.5-2=
12.7-3=
13.8-4=
14.6- 1=
15.9-3=
16.4-2=
17.3- 1=
18.2- 1=
19.8-3=
20.6-2=
Subtraction is the inverse of addition. Let's look at the calculation method of subtraction.
Calculation method of subtraction:
For example: 5-2=?
1. Subtract the minuend from the minuend to get 3.
2. If the minuend decimal is not 0, subtract the minuend decimal from the minuend decimal to get the final result.
Addition-subtraction mixing
2 1.2+3- 1=
22.5-2+ 1=
23.4+2- 1=
24.7-3+2=
25.9+ 1-4=
26.6-3+2=
27.8+2-3=
28. 1- 1+3=
29.2+4-3=
30.5-2+4=
The mixing of addition and subtraction is the combination of addition and subtraction. Let's look at the calculation method of addition, subtraction and mixing.
Calculation method of addition and subtraction mixing:
For example: 2+3- 1=?
1. Add first, and 2 plus 3 makes 5.
2. Then calculate the subtraction, and subtract 1 from the number obtained in the previous step to get the final result.
relative dimension
3 1.5 >2
32.7
33.8 > IV
34.6
35.9 > 3
36.4
37.3 > 1
38.2
39.8 > 3
40.6
Comparing sizes is a common operation in mathematics. Let's look at the method of comparing sizes.
Method of comparing sizes:
For example: 5>2
1. Compare the single digits of two numbers. If the single digits of the first number are greater than those of the second number, the first number is greater than the second number.
2. If the single digits of two numbers are equal, compare the ten digits of the two numbers; If the ten digits of the first number are greater than the ten digits of the second number, the first number is greater than the second number.
3. If the single digits of two numbers are equal to the ten digits, then the two numbers are equal.
Addition and subtraction of adjacent numbers
4 1. 1+2+3=
42.2+3+4=
43.3+4+5=
44.4+5+6=
45.5+6+7=
46.6+7+8=
47.7+8+9=
48.8+9+ 10=
49.9+ 10+ 1 1=
50. 10+ 1 1+ 12=
Addition and subtraction of adjacent numbers is a common operation in mathematics. Let's look at the addition and subtraction methods of adjacent numbers.
Addition and subtraction methods of adjacent numbers:
For example: 1+2+3=?
1. Add two adjacent numbers to get 3.
2. Add the number obtained in the previous step with the next number to get the final result.
increase
5 1.2×3=
52.4× 1=
53.5×2=
54.3×4=
55. 1×8=
56.7×2=
57.9× 1=
58.6×3=
59.8×2=
60.5×5=
Multiplication is a common operation in mathematics. Let's look at the method of multiplication.
Multiplication method:
For example: 2×3=?
1.2 and 3 are multiplied to get 6.
separate
6 1.6÷2=
62.7÷3=
63.8÷4=
64.6÷ 1=
65.9÷3=
66.4÷2=
67.3÷ 1=
68.2÷ 1=
69.8÷3=
70.6÷2=
Division is the inverse of multiplication. Let's look at the method of division.
Segmentation method:
For example: 6÷2=?
1. Divide the dividend by the divisor to get 3.
Multiplication of adjacent numbers
7 1. 1×2×3=
72.2×3×4=
73.3×4×5=
74.4×5×6=
75.5×6×7=
76.6×7×8=
77.7×8×9=
78.8×9× 10=
79.9× 10× 1 1=
80. 10× 1 1× 12=
Multiplication of adjacent numbers is a common operation in mathematics. Let's look at the method of multiplying adjacent numbers.
Method of multiplying adjacent numbers:
For example: 1×2×3=?
1. Multiply two adjacent numbers to get 2.
2. Multiply the number obtained in the previous step by the next number to get the final result.
Digital segmentation
8 1.2+8=
82.4+6=
83.5+5=
84.3+7=
85. 1+9=
86.7+3=
87.9+ 1=
88.6+4=
89.8+2=
90.5+5=
Digital splitting is a common operation in mathematics. Let's look at the method of number splitting.
How to split the number:
For example: 2+8=?
1. Divide 8 by 5 and 3 to get 2+5+3.
2. Two plus five equals seven.
3.