Example-1
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Example-2
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| 13.5 + 7.25 = (13 + 0.5) + (7 + 0.25) = 13 + 7 + 0.5 + 0.25 (Here we just added the rounded numbers first and later we added the decimal numbers :) = 21 + 0.5 + 0.25 = 21.75 |
200.57 + 21.25 = (200 + 0.57) + (21 + 0.25) = 200 + 21 + 0.57 + 0.25 (Here we just added the rounded numbers first and later we added the decimal numbers :) = 221 + 0.57 + 0.25 = 221.82 |
Example-3
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Example-4
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| 490.975 + 21.231 = (490 + 0.975) + (21 + 0.231) = 490 + 21 + 0.975 + 0.231 (Here we just added the rounded numbers first and later we added the decimal numbers and forward carry if any :) = 511 + 1.206 = 512.206 |
590.975 - 20.231 = (590 + 0.975) -(20 + 0.231) = (590 - 20) + (0.975 - 0.231) (Here we just added the rounded numbers first and later we added the decimal numbers ) = 570 + 0.744 = 570.744 |
Example-5
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| 12.5 + 6.25 = (12 + 0.5) + (6 + 0.25) = 12 + 6 + 0.5 + 0.25 //add the integers then the decimals = 18 + 0.5 + 0.25 = 18.75 |
Test-YourSelf:
1- 215.55 + 28.67
2- 197.88 + 98.300
3- 587.91 + 109.105
4- 856.87 + 456.009
5- 566-76 - 45.25
6- 456.156 - 56.100
7- 9956-786 - 567.567
9- 4444.555 - 3456.921
10- 234.67 - 100.360