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135
They can be: 27 times 5 = 135
27/40 67.5/100 = 135/200 (multiply top and bottom by 2 to make whole numbers) = 27/40 (divide top and bottom by hcf(135, 200) = 5)
To figure this out you should first express the numbers as the product of their prime factors: 27 = 3x3x3 45 = 3x3x5 The next step is to identify any common prime factors. Both numbers have two 3s as prime factors. Multiply these together and you get: 3x3 = 9 Thus 9 is the HCF of 27 and 45.