Write 640 : 30 in the lowest form.

Find the GCD (or HCF) of numerator and denominator. GCD of 640 and 30 is 10.

640 ÷ 1030 ÷ 10.

Reduced fraction: 643. Therefore, 640/30 simplified to lowest terms is 64/3.

should be 64:3

Step-by-step explanation:

divide by 10

the circumference of a circle is, 10.676 cm.

step-by-step explanation:

the formula for circumference of a circle is given by:

where

c is the circumference of a circle and

d is the diameter of a circle.

given: diameter(d) = 3.4 cm and use

substitute these values in [1] we get;

cm

therefore, the circumference of a circle is, 10.676 cm

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