1. 50 m : 30 m
First, we can tell that both these numbers have the same unit (m), so we don't need to convert anything.
Second, both these numbers are divisible by 10. 50m/10 : 30m/10 = 5m : 3m
5m : 3m is the simplest ratio.
2. 6 ft to 6 yds (can be written as 6ft : 6yd)
First, we need to convert ft to yds in order to have the same unit. We know that 3ft = 1yd, so divide 6 by 3 and you get 2yds.
Now the ratio is 2yd : 6yd.
Second, both these numbers are divisible by 2. 2yd/2 : 6yd/2 = 1yd : 3yd
3. 120 ft / 13.36 cm (can be written as 120ft : 13.36cm
First, we realize we need to convert to make the units the same. There are 30.48 cm in 1 ft. 30.48 cm x 120 = 3657.6cm
Now the ratio is 3657.6cm : 13.36cm
First we add the numbers: 10,157 + 9987 = 20,144
To round, you take the hundreds number (in this case 1) and if it's 1,2,3,or 4, you round down, making the number just 20,000. If the hundreds number is 5,6,7,8, or 9, you round up, making the number 21,000. In this case, since the hundreds number is 1, we round down to 20,000.
Hope this helps!