2.1.9
Method I - Nines Complement Method
Nines Complement Method: 753 − 491
Nines Complement Method: 753 − 491
Step 1
Step 1
- Instead of subtracting from 753, we start by subtracting 491 from 999. It is easy to subtract any number from 999.
Step 2
Step 2
- 508 is the ‘9s complement’ of 491.
- Now add 508 to 753.
Step 3
Step 3
- Subtract 1000 from the total, then add 1.
- This is equivalent to subtracting 999.
1Course Overview
1.1Course Structure & Commonly Asked Questions
2Subtraction: KS2/3
2.1Subtraction Methods
2.1.1Method A - Decomposition Method
2.1.2Method B - Equal Addition Method
2.1.3Method C - Expanded Form Method
2.1.4Method D - Partitioning Method
2.1.5Method E - Counting-Up Method
2.1.6Method F - Constant Difference Method
2.1.7Method G - Partial Differences Method
2.1.8Method H - Complementary Method
2.1.9Method I - Nines Complement Method
3Expanding Double Brackets: KS3/4
Jump to other topics
1Course Overview
1.1Course Structure & Commonly Asked Questions
2Subtraction: KS2/3
2.1Subtraction Methods
2.1.1Method A - Decomposition Method
2.1.2Method B - Equal Addition Method
2.1.3Method C - Expanded Form Method
2.1.4Method D - Partitioning Method
2.1.5Method E - Counting-Up Method
2.1.6Method F - Constant Difference Method
2.1.7Method G - Partial Differences Method
2.1.8Method H - Complementary Method
2.1.9Method I - Nines Complement Method
3Expanding Double Brackets: KS3/4
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