คำตอบ - Long addition
คำอธิบายทีละขั้นตอน
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| Carry | |||||||||
| 7 | 8 | 6 | 7 | 3 | 0 | 4 | 0 | 3 | |
| + | 6 | 7 | 2 | 3 | 0 | 4 | |||
2. Add up the digits in each column, from right to left
Add the numbers in the ones place value.
3+4=7
Write 7 in the ones place.
| Place value | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| Carry | |||||||||
| 7 | 8 | 6 | 7 | 3 | 0 | 4 | 0 | 3 | |
| + | 6 | 7 | 2 | 3 | 0 | 4 | |||
| 7 |
Add the numbers in the tens place value.
0+0=0
Write 0 in the tens place.
| Place value | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| Carry | |||||||||
| 7 | 8 | 6 | 7 | 3 | 0 | 4 | 0 | 3 | |
| + | 6 | 7 | 2 | 3 | 0 | 4 | |||
| 0 | 7 |
Add the numbers in the hundreds place value.
4+3=7
Write 7 in the hundreds place.
| Place value | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| Carry | |||||||||
| 7 | 8 | 6 | 7 | 3 | 0 | 4 | 0 | 3 | |
| + | 6 | 7 | 2 | 3 | 0 | 4 | |||
| 7 | 0 | 7 |
Add the numbers in the thousands place value.
0+2=2
Write 2 in the thousands place.
| Place value | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| Carry | |||||||||
| 7 | 8 | 6 | 7 | 3 | 0 | 4 | 0 | 3 | |
| + | 6 | 7 | 2 | 3 | 0 | 4 | |||
| 2 | 7 | 0 | 7 |
Add the numbers in the ten thousands place value.
3+7=10
Write 0 in the ten thousands place.
Because the sum is greater than 9, carry the 1 to the hundred thousands place.
| Place value | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| Carry | 1 | ||||||||
| 7 | 8 | 6 | 7 | 3 | 0 | 4 | 0 | 3 | |
| + | 6 | 7 | 2 | 3 | 0 | 4 | |||
| 0 | 2 | 7 | 0 | 7 |
Add the numbers in the hundred thousands place value.
1+7+6=14
Write 4 in the hundred thousands place.
Because the sum is greater than 9, carry the 1 to the millions place.
| Place value | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| Carry | 1 | 1 | |||||||
| 7 | 8 | 6 | 7 | 3 | 0 | 4 | 0 | 3 | |
| + | 6 | 7 | 2 | 3 | 0 | 4 | |||
| 4 | 0 | 2 | 7 | 0 | 7 |
Add the numbers in the millions place value.
1+6=7
Write 7 in the millions place.
| Place value | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| Carry | 1 | 1 | |||||||
| 7 | 8 | 6 | 7 | 3 | 0 | 4 | 0 | 3 | |
| + | 6 | 7 | 2 | 3 | 0 | 4 | |||
| 7 | 4 | 0 | 2 | 7 | 0 | 7 |
Add the numbers in the ten millions place value.
Write 8 in the ten millions place.
| Place value | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| Carry | 1 | 1 | |||||||
| 7 | 8 | 6 | 7 | 3 | 0 | 4 | 0 | 3 | |
| + | 6 | 7 | 2 | 3 | 0 | 4 | |||
| 8 | 7 | 4 | 0 | 2 | 7 | 0 | 7 |
Add the numbers in the hundred millions place value.
Write 7 in the hundred millions place.
| Place value | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| Carry | 1 | 1 | |||||||
| 7 | 8 | 6 | 7 | 3 | 0 | 4 | 0 | 3 | |
| + | 6 | 7 | 2 | 3 | 0 | 4 | |||
| 7 | 8 | 7 | 4 | 0 | 2 | 7 | 0 | 7 |
The solution is: 787,402,707
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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.