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long subtraction 10300−7785
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Solution
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10300−7785
Line up the numbers
1
0
3
0
0
−
0
7
7
8
5
Subtract each column of digits, starting from the right and working left If the digit being subtracted is larger than the digit above it, 'borrow' a digit from the next column to the left.
In the bolded column, subtract the second digit from the first
1
0
3
0
0
−
0
7
7
8
5
The bottom number is larger than the upper number. Try to 'borrow' a digit from the left.
The top digit is not bigger than the bottom one. Try to 'borrow' a digit from the left.
1
0
3
0
0
−
0
7
7
8
5
The top digit is not bigger than the bottom one. Try to 'borrow' a digit from the left.
1
0
3
0
0
−
0
7
7
8
5
The top digit is not bigger than the bottom one. Try to 'borrow' a digit from the left.
1
0
3
0
0
−
0
7
7
8
5
Borrow 1 from 1. The remainder is 0
0
10
1
0
3
0
0
−
0
7
7
8
5
Add 1 ten to 0: 10+0=10
0
10
1
0
3
0
0
−
0
7
7
8
5
Borrow 1 from 10. The remainder is 9
0
9
10
1
10
3
0
0
−
0
7
7
8
5
Add 1 ten to 3: 10+3=13
0
9
13
1
10
3
0
0
−
0
7
7
8
5
Borrow 1 from 13. The remainder is 12
0
9
12
10
1
10
13
0
0
−
0
7
7
8
5
Add 1 ten to 0: 10+0=10
0
9
12
10
1
10
13
0
0
−
0
7
7
8
5
Borrow 1 from 10. The remainder is 9
0
9
12
9
10
1
10
13
10
0
−
0
7
7
8
5
Add 1 ten to 0: 10+0=10
0
9
12
9
10
1
10
13
10
0
−
0
7
7
8
5
In the bolded column, subtract the second digit from the first: 10−5=5
0
9
12
9
10
1
10
13
10
0
−
0
7
7
8
5
5
In the bolded column, subtract the second digit from the first: 9−8=1
0
9
12
9
10
1
10
13
10
0
−
0
7
7
8
5
1
5
In the bolded column, subtract the second digit from the first: 12−7=5
0
9
12
9
10
1
10
13
10
0
−
0
7
7
8
5
5
1
5
In the bolded column, subtract the second digit from the first: 9−7=2
0
9
12
9
10
1
10
13
10
0
−
0
7
7
8
5
2
5
1
5
In the bolded column, subtract the second digit from the first: 0−0=0