2.1.6
Method F - Constant Difference Method
Constant Difference Theory: 753 − 491
Constant Difference Theory: 753 − 491
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Step 1
Step 1
- We are trying to avoid any carrying or exchanging – the problem is the middle digit in the subtrahend being a 9.
- So we could add 10 to both the minuend and the subtrahend to make the subtraction easier.
Step 2
Step 2
- We write out the new subtraction in the usual column format.
- This isn’t totally necessary though because we just need to subtract the hundreds from the hundreds, the tens from the tens and the ones from the ones.
- We can work left to right or right to left (because no exchanges are required), with or without the column format.
Answer
Answer
- So if 763 − 501 = 262, then 753 − 491 = 262.
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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