Solve: what is the greatest length of a tape whose whole length can be measure the lengths 56 cm and 140 cm exactly ?
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Find the prime factors of 56 and 140:
56 = 2³ x 7
140 = 2² x 5 x 7
Find the HCF :
HCF = 2² x 7 = 28 cm
The greatest length of the tape is 28cm
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