คำตอบ - Long addition
คำอธิบายทีละขั้นตอน
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| Carry | ||||||||
| 1 | 2 | 3 | 7 | 5 | 7 | 8 | 9 | |
| + | 8 | 9 | 5 | 7 | 0 | 2 | 2 | |
2. Add up the digits in each column, from right to left
Add the numbers in the ones place value.
9+2=11
Write 1 in the ones place.
Because the sum is greater than 9, carry the 1 to the tens place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| Carry | 1 | |||||||
| 1 | 2 | 3 | 7 | 5 | 7 | 8 | 9 | |
| + | 8 | 9 | 5 | 7 | 0 | 2 | 2 | |
| 1 |
Add the numbers in the tens place value.
1+8+2=11
Write 1 in the tens place.
Because the sum is greater than 9, carry the 1 to the hundreds place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| Carry | 1 | 1 | ||||||
| 1 | 2 | 3 | 7 | 5 | 7 | 8 | 9 | |
| + | 8 | 9 | 5 | 7 | 0 | 2 | 2 | |
| 1 | 1 |
Add the numbers in the hundreds place value.
1+7+0=8
Write 8 in the hundreds place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| Carry | 1 | 1 | ||||||
| 1 | 2 | 3 | 7 | 5 | 7 | 8 | 9 | |
| + | 8 | 9 | 5 | 7 | 0 | 2 | 2 | |
| 8 | 1 | 1 |
Add the numbers in the thousands place value.
5+7=12
Write 2 in the thousands place.
Because the sum is greater than 9, carry the 1 to the ten thousands place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| Carry | 1 | 1 | 1 | |||||
| 1 | 2 | 3 | 7 | 5 | 7 | 8 | 9 | |
| + | 8 | 9 | 5 | 7 | 0 | 2 | 2 | |
| 2 | 8 | 1 | 1 |
Add the numbers in the ten thousands place value.
1+7+5=13
Write 3 in the ten thousands place.
Because the sum is greater than 9, carry the 1 to the hundred thousands place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| Carry | 1 | 1 | 1 | 1 | ||||
| 1 | 2 | 3 | 7 | 5 | 7 | 8 | 9 | |
| + | 8 | 9 | 5 | 7 | 0 | 2 | 2 | |
| 3 | 2 | 8 | 1 | 1 |
Add the numbers in the hundred thousands place value.
1+3+9=13
Write 3 in the hundred thousands place.
Because the sum is greater than 9, carry the 1 to the millions place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| Carry | 1 | 1 | 1 | 1 | 1 | |||
| 1 | 2 | 3 | 7 | 5 | 7 | 8 | 9 | |
| + | 8 | 9 | 5 | 7 | 0 | 2 | 2 | |
| 3 | 3 | 2 | 8 | 1 | 1 |
Add the numbers in the millions place value.
1+2+8=11
Write 1 in the millions place.
Because the sum is greater than 9, carry the 1 to the ten millions place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| Carry | 1 | 1 | 1 | 1 | 1 | 1 | ||
| 1 | 2 | 3 | 7 | 5 | 7 | 8 | 9 | |
| + | 8 | 9 | 5 | 7 | 0 | 2 | 2 | |
| 1 | 3 | 3 | 2 | 8 | 1 | 1 |
Add the numbers in the ten millions place value.
1+1=2
Write 2 in the ten millions place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| Carry | 1 | 1 | 1 | 1 | 1 | 1 | ||
| 1 | 2 | 3 | 7 | 5 | 7 | 8 | 9 | |
| + | 8 | 9 | 5 | 7 | 0 | 2 | 2 | |
| 2 | 1 | 3 | 3 | 2 | 8 | 1 | 1 |
The solution is: 21,332,811
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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.