Final answer:
The square root of 20 lies between the whole numbers 4 and 5, since it falls between the perfect squares of these numbers, which are 16 and 25 respectively.
Step-by-step explanation:
The square root of 20 lies between which pair of whole numbers? To answer this, we must find the whole numbers that are the perfect squares closest to 20 without exceeding it. We know that 4 squared (4²) is 16 and 5 squared (5²) is 25. Since 20 falls between 16 and 25, the square root of 20 must lie between 4 and 5. Therefore, the square root of 20 lies between the whole numbers 4 and 5.