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what is  ganeral rule how it is done

Asked by nsirsa 17th September 2016, 9:25 AM
Answered by Expert
Answer:
begin mathsize 12px style The space general space rule space is comma space apostrophe apostrophe Round space off space each space factor space to space its space greatest space place comma space then space multiply space the space rounded space off space factors. apostrophe apostrophe
We space will space use space this space rule space to space estimate space product space or space addition space or space subtraction. space This space is space used space so space that space in space situations space where space we space cannot space get space the space exact space numbers comma
we space can space find space an space approximate space number. space We space use space the space general space rule space stated space above space to space help space us space approximate space product comma space sum space and space difference.
Example 1 space colon
Estimate space the space following space product space using space the space general space rule.
578 space cross times 34
Solution colon
Rounding space off space by space the space general space rule comma
we space get space 578 space can space be space rounded space off space to space 600 space left parenthesis rounded space off space to space hundreds space place right parenthesis
and space 34 space to space 30 space left parenthesis rounded space off space to space tens space place right parenthesis
So comma space 600 cross times 30 space equals space 18000

Example space 2 colon space
Estimate space the space following space sum space using space the space general space rule.
439 space plus space 334 space plus space 4317
Rounding space off space to space the space nearest space hundreds comma space 439 comma space 334 space and space 4317 space can space be space rounded space off space to space 400 comma space 300 space and space 4300 space respectively.
400 space plus space 300 space plus space 4300 equals 5000

Rounding space off space to space the space nearest space tens comma space 439 comma space 334 space and space 4317 space can space be space rounded space off space to space 440 comma space 330 space and space 4320 space respectively.
440 space plus space 330 space thin space plus space 4320 space equals space 5090

Note colon space In space short comma space to space round space off space to space tens space check space if space the space number space is space closer space to space which space multiple space of space in space its space tens space place.
Example colon thin space 14 space is space closer space to space 10 space rather space than space 20
115 space should space be space rounded space off space space to space 100 space if space space while space rounding space off space to space hundreds space since space it space is space closer space to space 100 space than space 200. end style
Answered by Expert 17th September 2016, 10:53 PM
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