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Because your calculator is broken. Seriously; 30 divided by half (0.5) is 60 and 60 + 10 = 70 So, 30 cut in half (30/2) is 15 but 30 DIVIDED BY half (30/0.5) is 60.
30/0.5 + 10 = 70
Half of 30 is 15 ... adding 10 would then equal 25. 30/2=15 + 10 = 25 Trick question...one half is .5...not one half of thirty. So 30 divided by .5 is 60. Plus 10 would make the answer 70...
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30/0.5 = 60 + 10 - 2 = 68
70: 30 divided by 1/2=60+10=70 trick: not 30 divided by 2