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OpenStudy (rjtrain1):
Estimate the difference using front-end estimation. 987.12 - 342.5 700 600 500 400
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OpenStudy (triciaal):
front-end estimation. estimate first then do the operation here do to the nearest hundred first then the subtraction
OpenStudy (jackthegreatest):
987 --> 1000 342--> 300 1000-300 = ?
OpenStudy (rjtrain1):
700
OpenStudy (jackthegreatest):
yes
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