Soluzione - Long subtraction

1.200.025.500

1.200.025.500

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Spiegazione passo passo

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

	1	2	0	0	0	5	0	0	0	0
-						2	4	5	0	0

2. Subtract the numbers using long subtraction method

Subtract the numbers in the ones column from the top number:
0-0=0

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones

	1	2	0	0	0	5	0	0	0	0
-						2	4	5	0	0
										0

Subtract the numbers in the tens column from the top number:
0-0=0

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones

	1	2	0	0	0	5	0	0	0	0
-						2	4	5	0	0
									0	0

Because the upper digit (0) in the hundreds column is too small to get a positive difference, borrow 1 from the number to the left (50) which becomes (49) and get (10).

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones
						4	9	10
	1	2	0	0	0	5	0	0	0	0
-						2	4	5	0	0
									0	0

Subtract the numbers in the hundreds column from the top number:
10-5=5

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones
						4	9	10
	1	2	0	0	0	5	0	0	0	0
-						2	4	5	0	0
								5	0	0

Subtract the numbers in the thousands column from the top number:
9-4=5

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones
						4	9	10
	1	2	0	0	0	5	0	0	0	0
-						2	4	5	0	0
							5	5	0	0

Subtract the numbers in the ten thousands column from the top number:
4-2=2

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones
						4	9	10
	1	2	0	0	0	5	0	0	0	0
-						2	4	5	0	0
						2	5	5	0	0

Write 0 in the hundred thousands place.

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones
						4	9	10
	1	2	0	0	0	5	0	0	0	0
-						2	4	5	0	0
					0	2	5	5	0	0

Write 0 in the millions place.

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones
						4	9	10
	1	2	0	0	0	5	0	0	0	0
-						2	4	5	0	0
				0	0	2	5	5	0	0

Write 0 in the ten millions place.

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones
						4	9	10
	1	2	0	0	0	5	0	0	0	0
-						2	4	5	0	0
			0	0	0	2	5	5	0	0

Write 2 in the hundred millions place.

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones
						4	9	10
	1	2	0	0	0	5	0	0	0	0
-						2	4	5	0	0
		2	0	0	0	2	5	5	0	0

Write 1 in the billions place.

Place value	billions	hundred millions	ten millions	millions	hundred thousands	ten thousands	thousands	hundreds	tens	ones
						4	9	10
	1	2	0	0	0	5	0	0	0	0
-						2	4	5	0	0
	1	2	0	0	0	2	5	5	0	0

The solution is: 1,200,025,500

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