To finish sewing her tapestry, Petra needs 142 strips of cloth that are each one quarter of a yard. How moany yards of cloth is that?
$${\mathtt{142}}{\mathtt{\,\times\,}}\left({\frac{{\mathtt{1}}}{{\mathtt{4}}}}\right) = {\frac{{\mathtt{71}}}{{\mathtt{2}}}} = {\mathtt{35.5}}$$ yards of cloth.
She has 142 strips
Each covers 1/4 of a yard
The total amount of cloth in yards will be how many strips she has, multiplied by the number of yards per cloth.
Total yards of cloth = 142 * 1/4 = 35 1/2 = 35.5