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.
Well done!
Well done!
Thank you for completing our CPD course. We hope you've enjoyed it and that it has given you some ideas for your own classroom.
1Course Overview
1.1Course Structure & Commonly Asked Questions
2Subtraction Methods
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
Jump to other topics
1Course Overview
1.1Course Structure & Commonly Asked Questions
2Subtraction Methods
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
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