Find the l.c.m of 200 and 45

the lowest common multiple of the above numbers is 1800

Step-by-step explanation:

list all multiples of the given numbers and look which number is common in both numbers and find the lowest one

3/10

Step-by-step explanation:

Change 20% to a fraction

20% = 20/100 = 1/5

She has completed 1/2 and 1/5

1/2+1/5

Getting a common denominator of 10

1/2*5/5 + 1/5*2/2

5/10 + 2/10

7/10

She has completed 7/10

10/10 -7/10 = 3/10

She still needs to complete 3/10