คำตอบ - Long addition
คำอธิบายทีละขั้นตอน
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths |
| Carry | ||||||||
| 6 | . | 5 | ||||||
| + | 9 | . | 0 | 0 | 0 | 0 | 0 | 1 |
| . |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths |
| Carry | |||||||||
| 6 | . | 5 | 0 | 0 | 0 | 0 | 0 | ||
| + | 9 | . | 0 | 0 | 0 | 0 | 0 | 1 | |
| . |
2. Add up the digits in each column, from right to left
Add the numbers in the millionths place value.
0+1=1
Write 1 in the millionths place.
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths |
| Carry | |||||||||
| 6 | . | 5 | 0 | 0 | 0 | 0 | 0 | ||
| + | 9 | . | 0 | 0 | 0 | 0 | 0 | 1 | |
| . | 1 |
Add the numbers in the hundred thousandths place value.
0+0=0
Write 0 in the hundred thousandths place.
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths |
| Carry | |||||||||
| 6 | . | 5 | 0 | 0 | 0 | 0 | 0 | ||
| + | 9 | . | 0 | 0 | 0 | 0 | 0 | 1 | |
| . | 0 | 1 |
Add the numbers in the ten thousandths place value.
0+0=0
Write 0 in the ten thousandths place.
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths |
| Carry | |||||||||
| 6 | . | 5 | 0 | 0 | 0 | 0 | 0 | ||
| + | 9 | . | 0 | 0 | 0 | 0 | 0 | 1 | |
| . | 0 | 0 | 1 |
Add the numbers in the thousandths place value.
0+0=0
Write 0 in the thousandths place.
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths |
| Carry | |||||||||
| 6 | . | 5 | 0 | 0 | 0 | 0 | 0 | ||
| + | 9 | . | 0 | 0 | 0 | 0 | 0 | 1 | |
| . | 0 | 0 | 0 | 1 |
Add the numbers in the hundredths place value.
0+0=0
Write 0 in the hundredths place.
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths |
| Carry | |||||||||
| 6 | . | 5 | 0 | 0 | 0 | 0 | 0 | ||
| + | 9 | . | 0 | 0 | 0 | 0 | 0 | 1 | |
| . | 0 | 0 | 0 | 0 | 1 |
Add the numbers in the tenths place value.
5+0=5
Write 5 in the tenths place.
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths |
| Carry | |||||||||
| 6 | . | 5 | 0 | 0 | 0 | 0 | 0 | ||
| + | 9 | . | 0 | 0 | 0 | 0 | 0 | 1 | |
| . | 5 | 0 | 0 | 0 | 0 | 1 |
Add the numbers in the ones place value.
6+9=15
Write 5 in the ones place.
Because the sum is greater than 9, carry the 1 to the tens place.
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths |
| Carry | 1 | ||||||||
| 6 | . | 5 | 0 | 0 | 0 | 0 | 0 | ||
| + | 9 | . | 0 | 0 | 0 | 0 | 0 | 1 | |
| 5 | . | 5 | 0 | 0 | 0 | 0 | 1 |
Add the numbers in the tens place value.
Write 1 in the tens place.
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths |
| Carry | 1 | ||||||||
| 6 | . | 5 | 0 | 0 | 0 | 0 | 0 | ||
| + | 9 | . | 0 | 0 | 0 | 0 | 0 | 1 | |
| 1 | 5 | . | 5 | 0 | 0 | 0 | 0 | 1 |
The solution is: 15.500001
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Addition is the most basic math action and is used daily by almost everybody. Playing games, paying at the supermarket, and cooking are just a few examples of when we add.
Long addition is a clear and simple method to add numbers. Especially big numbers.
Although today calculators do this job for us, understanding the concept of addition is a key ability for understanding math.