Written Subtraction
Align the digits
\( 503 – 47 \)
Set up in columns correctly.
2-digit – 1-digit (no exchange)
\( 28 – 5 \)
No carrying required.
2-digit – 1-digit (with exchange)
\( 23 – 7 \)
Requires carrying.
2-digit – 2-digit (no exchange)
\( 58 – 32 \)
No carrying required.
2-digit – 2-digit (exchange ones)
\( 53 – 27 \)
Carry from ones.
Subtract from Multiple of 10
\( 50 – 23 \)
Zero in ones place.
3-digit – 1-digit (no exchange)
\( 245 – 3 \)
Simple subtraction.
3-digit – 1-digit (with exchange)
\( 243 – 7 \)
Carry required.
3-digit – 1-digit (cascading)
\( 203 – 7 \)
Exchange across zero.
3-digit – 2-digit (no exchange)
\( 568 – 43 \)
Simple subtraction.
3-digit – 2-digit (exchange ones)
\( 563 – 48 \)
Carry from ones.
3-digit – 2-digit (exchange tens)
\( 536 – 82 \)
Carry from tens.
3-digit – 2-digit (exchange both)
\( 532 – 78 \)
Double carry required.
3-digit – 3-digit (no exchange)
\( 865 – 432 \)
Simple subtraction.
3-digit – 3-digit (exchange ones)
\( 863 – 437 \)
Carry from ones.
3-digit – 3-digit (exchange tens)
\( 836 – 472 \)
Carry from tens.
3-digit – 3-digit (exchange both)
\( 832 – 478 \)
Double carry required.
Zero in tens column
\( 502 – 347 \)
Cascading exchange.
Zero in ones column
\( 520 – 347 \)
Carry required.
4-digit – 1-digit (no exchange)
\( 3456 – 4 \)
Simple subtraction.
4-digit – 1-digit (with exchange)
\( 3452 – 7 \)
Carry required.
4-digit – 1-digit (cascading)
\( 3002 – 7 \)
Exchange across zeros.
4-digit – 2-digit (no exchange)
\( 3456 – 34 \)
Simple subtraction.
4-digit – 2-digit (with exchange)
\( 3453 – 78 \)
Carry required.
4-digit – 3-digit (no exchange)
\( 5678 – 432 \)
Simple subtraction.
4-digit – 3-digit (with exchange)
\( 5634 – 478 \)
Carry required.
4-digit – 3-digit (cascading)
\( 5003 – 478 \)
Exchange across zeros.
4-digit – 4-digit (no exchange)
\( 8765 – 4321 \)
Simple subtraction.
4-digit – 4-digit (with exchange)
\( 8732 – 4578 \)
Carry required.
4-digit – 4-digit (cascading)
\( 5002 – 2347 \)
Exchange across zeros.
Multiple of 1000
\( 5000 – 2347 \)
Exchange across all zeros.
Subtract from Multiple of 100
\( 500 – 247 \)
Exchange across zeros.
Subtract from Multiple of 1000
\( 1000 – 347 \)
Exchange across zeros.
Answer is 1-Digit
\( 503 – 498 \)
Close numbers.
Answer is 2-Digit
\( 502 – 456 \)
Hundreds become zero.
Answer is 3-Digit
\( 5003 – 4567 \)
Thousands become zero.
Timer (Optional)
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