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Solution - Long addition

6800000000.00005

6800000000.00005

See steps

Step-by-step explanation

1. Rewrite the numbers from top to bottom, aligned by their place values

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths
TABLE_NAME_CARRY
	6	8	0	0	0	0	0	0	0	0
+										0	.	0	0	0	0	5
											.

Put zeros in the blank number places:

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths
TABLE_NAME_CARRY
	6	8	0	0	0	0	0	0	0	0	.	0	0	0	0	0
+										0	.	0	0	0	0	5
											.

2. Add up the digits in each column, from right to left

Add the numbers in the hundred thousandths place value.
0+5=5

Write 5 in the hundred thousandths place.

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths
TABLE_NAME_CARRY
	6	8	0	0	0	0	0	0	0	0	.	0	0	0	0	0
+										0	.	0	0	0	0	5
											.					5

Add the numbers in the ten thousandths place value.
0+0=0

Write 0 in the ten thousandths place.

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths
TABLE_NAME_CARRY
	6	8	0	0	0	0	0	0	0	0	.	0	0	0	0	0
+										0	.	0	0	0	0	5
											.				0	5

Add the numbers in the thousandths place value.
0+0=0

Write 0 in the thousandths place.

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths
TABLE_NAME_CARRY
	6	8	0	0	0	0	0	0	0	0	.	0	0	0	0	0
+										0	.	0	0	0	0	5
											.			0	0	5

Add the numbers in the hundredths place value.
0+0=0

Write 0 in the hundredths place.

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths
TABLE_NAME_CARRY
	6	8	0	0	0	0	0	0	0	0	.	0	0	0	0	0
+										0	.	0	0	0	0	5
											.		0	0	0	5

Add the numbers in the tenths place value.
0+0=0

Write 0 in the tenths place.

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths
TABLE_NAME_CARRY
	6	8	0	0	0	0	0	0	0	0	.	0	0	0	0	0
+										0	.	0	0	0	0	5
											.	0	0	0	0	5

Add the numbers in the ones place value.
0+0=0

Write 0 in the ones place.

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths
TABLE_NAME_CARRY
	6	8	0	0	0	0	0	0	0	0	.	0	0	0	0	0
+										0	.	0	0	0	0	5
										0	.	0	0	0	0	5

Add the numbers in the tens place value.

Write 0 in the tens place.

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths
TABLE_NAME_CARRY
	6	8	0	0	0	0	0	0	0	0	.	0	0	0	0	0
+										0	.	0	0	0	0	5
									0	0	.	0	0	0	0	5

Add the numbers in the hundreds place value.

Write 0 in the hundreds place.

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths
TABLE_NAME_CARRY
	6	8	0	0	0	0	0	0	0	0	.	0	0	0	0	0
+										0	.	0	0	0	0	5
								0	0	0	.	0	0	0	0	5

Add the numbers in the thousands place value.

Write 0 in the thousands place.

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths
TABLE_NAME_CARRY
	6	8	0	0	0	0	0	0	0	0	.	0	0	0	0	0
+										0	.	0	0	0	0	5
							0	0	0	0	.	0	0	0	0	5

Add the numbers in the ten thousands place value.

Write 0 in the ten thousands place.

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths
TABLE_NAME_CARRY
	6	8	0	0	0	0	0	0	0	0	.	0	0	0	0	0
+										0	.	0	0	0	0	5
						0	0	0	0	0	.	0	0	0	0	5

Add the numbers in the hundred thousands place value.

Write 0 in the hundred thousands place.

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths
TABLE_NAME_CARRY
	6	8	0	0	0	0	0	0	0	0	.	0	0	0	0	0
+										0	.	0	0	0	0	5
					0	0	0	0	0	0	.	0	0	0	0	5

Add the numbers in the millions place value.

Write 0 in the millions place.

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths
TABLE_NAME_CARRY
	6	8	0	0	0	0	0	0	0	0	.	0	0	0	0	0
+										0	.	0	0	0	0	5
				0	0	0	0	0	0	0	.	0	0	0	0	5

Add the numbers in the ten millions place value.

Write 0 in the ten millions place.

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths
TABLE_NAME_CARRY
	6	8	0	0	0	0	0	0	0	0	.	0	0	0	0	0
+										0	.	0	0	0	0	5
			0	0	0	0	0	0	0	0	.	0	0	0	0	5

Add the numbers in the hundred millions place value.

Write 8 in the hundred millions place.

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths
TABLE_NAME_CARRY
	6	8	0	0	0	0	0	0	0	0	.	0	0	0	0	0
+										0	.	0	0	0	0	5
		8	0	0	0	0	0	0	0	0	.	0	0	0	0	5

Add the numbers in the billions place value.

Write 6 in the billions place.

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths
TABLE_NAME_CARRY
	6	8	0	0	0	0	0	0	0	0	.	0	0	0	0	0
+										0	.	0	0	0	0	5
	6	8	0	0	0	0	0	0	0	0	.	0	0	0	0	5

The solution is: 6800000000.00005

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Why learn this

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.

Terms and topics

Long addition