4.  Fill in the missing fractions.

             (a)   \frac{7}{10}-\square =\frac{3}{10}

            (b)   -\square \frac{3}{21}=\frac{5}{21}

            (c)   \square- \frac{3}{6}=\frac{3}{6}

            (d)   \square+ \frac{5}{27}=\frac{12}{27}

Answers (1)

(a)  \frac{7}{10}-\square =\frac{3}{10}

      \square\ =\ \frac{7}{10}\ -\ \frac{3}{10}

or    \square\ =\ \frac{5}{10}\ =\ \frac{1}{2}

 

(b) -\square \frac{3}{21}=\frac{5}{21}

       -\square =\frac{5}{3}

or     \square\ =\ -\ \frac{5}{3}

 

 (c)     \square- \frac{3}{6}=\frac{3}{6}

          \square\ =\ \frac{3}{6}\ +\ \frac{3}{6}\ =\ \frac{6}{6}\ =\ 1          

 

(d)      \square+ \frac{5}{27}=\frac{12}{27}

           \square\ =\ \frac{12}{27}\ -\ \frac{5}{27}

or            =\ \frac{7}{27}

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