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OpenStudy (anonymous):
Estimate the sum or difference. Use the benchmarks 0, 1/2 and 1. 2/15 + 13/30 Please Help! I will medal!!
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OpenStudy (anonymous):
@HelperJaje can you help me please?
OpenStudy (anonymous):
@HelperJaje ^
OpenStudy (loser66):
I think we have to use 1 to find sum. and then use 1/2 to find difference.
OpenStudy (loser66):
For sum, divide 1 into 30 box, pick 13 for 13/30 use multiplication to turn 2/15 to 4/30 then pick 4 more. By that way, you can show students how to calculate |dw:1451684027182:dw|2/15 +13/30
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