In each of the following examples, write the ratio of the first number to the second and also of the second number to the first. (Use the ratio symbol.)

(1) 10, 9
(2) 7, 22
(3) 2, 5
(4) 7, 11
(5) 13, 17

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Solution

(1) The first number is 10 and the second number is 9.
Ratio of the first number to the second number $= \frac{10}{9} = 10 : 9$

Ratio of the second number to the first number $= \frac{9}{10} = 9 : 10$

(2) The first number is 7 and the second number is 22.
Ratio of the first number to the second number $= \frac{7}{22} = 7 : 22$

Ratio of the second number to the first number $= \frac{22}{7} = 22 : 7$

(3) The first number is 2 and the second number is 5.
Ratio of the first number to the second number $= \frac{2}{5} = 2 : 5$

Ratio of the second number to the first number $= \frac{5}{2} = 5 : 2$

(4) The first number is 7 and the second number is 11.
Ratio of the first number to the second number $= \frac{7}{11} = 7 : 11$

Ratio of the second number to the first number $= \frac{11}{7} = 11 : 7$

(5) The first number is 13 and the second number is 17.
Ratio of the first number to the second number $= \frac{13}{17} = 13 : 17$

Ratio of the second number to the first number $= \frac{17}{13} = 17 : 13$

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