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question 4
1/2 x 1/3 = 1/6 (option A)
question 1
[tex]\tt 17\dfrac{3}{4}+21\dfrac{1}{6}=(17+21)+(\dfrac{3}{4}+\dfrac{1}{6})\\\\38+(\dfrac{9}{12}+\dfrac{2}{12})=38+\dfrac{11}{12}=38\dfrac{11}{12}[/tex]
question 2
[tex]\tt \dfrac{15}{10}=15:10[/tex]
