Compare 5 yd to 5 ft, 7in to 3ft, 3ft to 50in, 21ft to 4 yd, 9yd to 9in, 36in to 3ft

We know that

1 yard = 3 feet = 36 inches

To solve these types of problems, it's easiest to convert the number into one unit, and then compare.

1) Compare 5 yards to 5 feet

Let's convert to feet.

5 yards * 3 feet per yard = 15 feet
5 feet = 5 feet

Because 15 > 5, we know that 5 yards > 5 feet.

2) Compare 7 inches to 3 feet.

Let's convert to inches.

7 inches = 7 inches
3 feet * 12 inches per foot = 36 inches

Because 36 > 7, we know that 3 feet > 7 inches.

3) Compare 3 feet to 50 inches.

Let's convert to inches.

3 feet = 36 inches (we already did this above)
50 inches = 50 inches 

Because 50 > 30, we know that 50 inches > 3 feet.

4) Compare 21 feet to 4 yards.

Let's convert to feet.

21 feet = 21 feet
4 yards * 3 feet per yard = 12 feet

Because 21 > 12, we know that 21 feet > 4 yards.

5) Compare 9 yards to 9 inches.

For this problem, we don't need to do any calculations.  
We know that a yard is bigger than an inch, and therefore because there are equal amounts of these units, 9 yards > 9 inches.

6) Compare 36 inches to 3 feet

Let's convert to inches.

36 inches = 36 inches
3 feet * 12 inches per foot = 36 inches

Because 36 = 36, we can conclude that 36 inches = 3 feet.


I hope this helps!