31 + 49
Answer
80
Calculation Steps:
31 + 49
=80
Calculation Processes:
Single calculation
1
31 + 49
Exercise
31 + 49
Solution Process
Numbers with the same symbol are added, the symbol of the result remains the same, and the absolute value is added.
Answer
80
Vertical
TensOnes+3411980
Calculation Details
31 and 49 are all positive numbers.
Numbers with the same symbol are added, the symbol of the result remains the same, and the absolute value is added.
1
In vertical addition or subtraction, ensure that digits with the same place value are aligned.
1
The same digits must be aligned, usually starting from the ones digit; when calculating addition and subtraction of decimals, the decimal points must be aligned first.
2
Align the Ones digits 1 and 9.
TensOnes+3419
3
Align the Tens digits 3 and 4.
TensOnes+3419
2
In addition and subtraction, start calculations from the rightmost digit.
1
In math addition and subtraction, start at the last digit and work your way to the left, digit by digit, until the calculation is complete.
2
The numbers 1 and 9 in the Ones place are added together, and the result is 10. When the addition result is greater than or equal to 10, it is necessary to carry 1 to the previous digit, write the single digit 0 to the current column, and write the resulting carry 1 to the previous digit.
TensOnes+341190A more intuitive calculation method is to use a number line, where the point representing a number on the number line increases from left to right and decreases from right to left. Therefore, addition can be performed by moving to the right along the number line.1.Ones place: 1 + 9.1.1The point representing 1 on the number line is moved 9 units to the right along the number line, and the result is 10.Finally, the Ones place calculation yields 10, as 1 + 9 = 10.0(1)123456789101112131415(1)The point representing 1 on the number line is moved 9 units to the right along the number line, and the result is 10.
3
The sum of the digits 3 and 4 in the Tens place is 7. Adding the carry 1, the result is 8.
TensOnes+3411980A more intuitive calculation method is to use a number line, where the point representing a number on the number line increases from left to right and decreases from right to left. Therefore, addition can be performed by moving to the right along the number line.1.Tens place: 3 + 4.1.1The point representing 3 on the number line is moved 4 units to the right along the number line, and the result is 7.2.Add the carry of 1.Continue moving 1 units to the right along the number line, and the result is 8.Finally, the Tens place calculation yields 8, as 3 + 4 + 1 = 8.012(1)3456(2)78910111213(1)The point representing 3 on the number line is moved 4 units to the right along the number line, and the result is 7.(2)Continue moving 1 units to the right along the number line, and the result is 8.
3
Calculate 31 + 49. The result is 80.
2
Summarize
Finally, 31 + 49 equals 80.