Question 309829
1. 12 1/2 + 1/ 1/3
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= (2*12+1)/2 + 1*(3/1)
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= (25/2) + 3
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= (25/2) + (6/2)
= 31/2
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The confusing part here for me is, the 1/2 under the 1, how do I make the denominators the same? 
2. 2/ 1/2 + 1/1/5
Invert the denominators and multiply:
= (2*2) + (1*5)
= 9
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3. 3/7 x 2 x square root 49 divided 1/9 ?
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(3/7)*2*sqrt(49)/(1/9)
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= (6/7)*(7*9)
= (6/9)
= 2/3
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Cheers,
Stan H.