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Problem
$1.\dfrac {1} {2}+\dfrac {1} {2}=$ 11. 5 12 3 12 2. $\dfrac {1} {3}+\dfrac {1} {3}=$ 12. $\dfrac {2} {9}+\dfrac {8} {9}=$ $3.\dfrac {1} {4}+\dfrac {1} {4}=$ 13. $\dfrac {3} {4}+\dfrac {1} {4}+\dfrac {3} {4}=$ $4.\dfrac {1} {3}+\dfrac {2} {3}=$ 14. $\dfrac {3} {5}+\dfrac {1} {5}+\dfrac {3} {5}=$ 5. $\dfrac {1} {5}+\dfrac {3} {5}=$ $15.\dfrac {1} {6}+\dfrac {2} {6}+\dfrac {2} {6}=$ 6. $\dfrac {1} {6}+\dfrac {2} {6}=$ $16.$ $\dfrac {2} {7}+\dfrac {4} {7}+\dfrac {3} {7}=$ 7. $\dfrac {4} {7}+\dfrac {1} {7}=$ $17.\dfrac {1} {8}+\dfrac {3} {8}+\dfrac {2} {8}=$ 8. $\dfrac {3} {8}+\dfrac {4} {8}=$ 18. $\dfrac {4} {9}+\dfrac {8} {9}+\dfrac {7} {9}=$ 9. $\dfrac {2} {9}+\dfrac {5} {9}=$ 19. $\dfrac {9} {10}+\dfrac {5} {10}+\dfrac {9} {10}=$ 10. 10 +. 15 0 !3! 20. $\dfrac {7} {20}+\dfrac {8} {20}+\dfrac {3} {20}+\dfrac {10} {20}+\dfrac {14} {20}$