Here i an going to show you that how to do Subtractions Mentally. Have a look at the following example..
| Example-1 |
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| 586-331=? subtractions would be faster by taking two digits instead of taking a single digit at a time. Always start from right side and take two digit. So take 86 and 31 86 - 31 = 55 500 - 300 = 200 So, the result of 586-331= 255 |
Example-2
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| 756-385=? By taking two digits instead of taking a single digit at a time, Starting from right side and take two digit. So take 56 and 85 here 56<85 so we will borrow 1 from 7 and 56 becomes 156 (called complement of 100's) now subtract 156-85 = 71 So, the result of 756- 385 =371 |
Example-3
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| 730 - 156 + 523 - 814 = ?
when we have addition and subtraction both in single equation than first we add + signs number and in second part add - sign numbers
i.e (730 + 523)-(156 + 814)=1253 - 870 // apply example-2 rule because z 53<80.Borrow 1 from 12 =383 |