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Solution - Long addition

90.0000171

90.0000171

See steps

Step-by-step explanation

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

Place value	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths	millionths	ten millionths
TABLE_NAME_CARRY
	9	0
+		0	.	0	0	0	0	1	7	1
			.

Put zeros in the blank number places:

Place value	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths	millionths	ten millionths
TABLE_NAME_CARRY
	9	0	.	0	0	0	0	0	0	0
+		0	.	0	0	0	0	1	7	1
			.

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

Add the numbers in the ten millionths place value.
0+1=1

Write 1 in the ten millionths place.

Place value	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths	millionths	ten millionths
TABLE_NAME_CARRY
	9	0	.	0	0	0	0	0	0	0
+		0	.	0	0	0	0	1	7	1
			.							1

Add the numbers in the millionths place value.
0+7=7

Write 7 in the millionths place.

Place value	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths	millionths	ten millionths
TABLE_NAME_CARRY
	9	0	.	0	0	0	0	0	0	0
+		0	.	0	0	0	0	1	7	1
			.						7	1

Add the numbers in the hundred thousandths place value.
0+1=1

Write 1 in the hundred thousandths place.

Place value	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths	millionths	ten millionths
TABLE_NAME_CARRY
	9	0	.	0	0	0	0	0	0	0
+		0	.	0	0	0	0	1	7	1
			.					1	7	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	ten millionths
TABLE_NAME_CARRY
	9	0	.	0	0	0	0	0	0	0
+		0	.	0	0	0	0	1	7	1
			.				0	1	7	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	ten millionths
TABLE_NAME_CARRY
	9	0	.	0	0	0	0	0	0	0
+		0	.	0	0	0	0	1	7	1
			.			0	0	1	7	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	ten millionths
TABLE_NAME_CARRY
	9	0	.	0	0	0	0	0	0	0
+		0	.	0	0	0	0	1	7	1
			.		0	0	0	1	7	1

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

Write 0 in the tenths place.

Place value	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths	millionths	ten millionths
TABLE_NAME_CARRY
	9	0	.	0	0	0	0	0	0	0
+		0	.	0	0	0	0	1	7	1
			.	0	0	0	0	1	7	1

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

Write 0 in the ones place.

Place value	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths	millionths	ten millionths
TABLE_NAME_CARRY
	9	0	.	0	0	0	0	0	0	0
+		0	.	0	0	0	0	1	7	1
		0	.	0	0	0	0	1	7	1

Add the numbers in the tens place value.

Write 9 in the tens place.

Place value	tens	ones	.	tenths	hundredths	thousandths	ten thousandths	hundred thousandths	millionths	ten millionths
TABLE_NAME_CARRY
	9	0	.	0	0	0	0	0	0	0
+		0	.	0	0	0	0	1	7	1
	9	0	.	0	0	0	0	1	7	1

The solution is: 90.0000171

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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