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<span><span>15 - 19</span><span>1010</span></span> <span><span>In 15, multiply the whole number, '1', by the denominator of the fraction, '10' to get '10'. This shows that the whole number represents 10.</span><span>1010</span></span> To find the numerator when this mixed number is shown as an improper fraction, use addition. <span><span>10 + 5 = 15</span><span>101010</span></span> <span><span>In 19, multiply the whole number, '1', by the denominator of the fraction, '10' to get '10'. This shows that the whole number represents 10.</span><span>1010</span></span> To find the numerator when this mixed number is shown as an improper fraction, use addition. <span><span>10 + 9 = 19</span><span>101010</span></span> The addition is now simpler because the whole numbers have been eliminated, leaving only two fractions. <span><span>15 - 19</span><span>1010</span></span> Subtract the numerators. <span>-410</span> Simplify fraction -4/10 by dividing out the greatest common factor of 2 from the numerator and denominator. <span><span>-4 = -2</span><span>105</span></span>
To find the total area of the octagon you can find the area of the rectangle that is created by the entire figure and subtract the areas of the four congruent right triangles.
(10 cm x 6 cm) - [4(1/2 x 2 x 2)] 60 cm² -8 cm² = 52 cm²
