What can you say about the prime factorisations of the denominators of the following rationals:

What can you say about the prime factorisation of the denominators of the rational number 0.bar(1347)

What can you say about the resistance of an ammeter?

What is the prime factorisation of 37800?

What can you say about the resistance of a voltmeter?

Show that each of the following numbers is rational. What can you say about the prime factors of their denominators ? (i) 23.123456789 (ii) 32. overline(123456789)

What can you say about the ratio of areas of two similar triangles?

What can you say about the prime factors of their denominators ? (i) 12.123456789 (ii) 12.bar(123456789)

What can you say about the prime factors of their denominators ? (i) 12.123456789 (ii) 12.bar(123456789)

What can you say about the area of two congruent figures?