Question

Answers please and fast

Which expresses 1550 : 2000 as a decimal?



A.


0.08


B.


0.155


C.


0.31


D.


0.775

Answer 1

0.775

Explanation:

The quick way of doing this is to simply divide 1550 by 2000. Put it into your calculator as

1550

÷

2000

=

And it gives you 0.775

You could do it a longer but much more instructive way by factoring this into Prime factors.

1550: 2* 5 * 5 * 31

2000: 2 * 2 * 2 * 2 * 5 * 5 * 5

Now cancel out all the common factors.

2 * 5 * 5 is the HCF

31 in the numerator

40 in the denominator

Now divide these two 31 / 40 = 0.775

Either way, the answer is 0.775