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Move the decimal over 2 places to the right and divide by 100

2.75 mm = 275/100 mm

Simplify:

275/100 = 55/20 (we know both terms are divisible by 5)

55/20 = 11/4 (again, we know both terms are divisible by 5)

The answer is 11/4 mm (cannot be simplified any further)

An alternative way to approach this is to realize that 0.75 = 3/4

So 2+3/4 = 8/4+3/4 = 11/4

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13y ago

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