Infinitely many.
Strange though it may sound, there are exactly as many rationals between 2.1 and 2.2 as there are between 21 and 22 or between 0.21 and 22000000 (or any two rational numbers).
there are 3 prime numbers in between 21 and 33... they are 23,29, 31.
The prime numbers between 21 and 40 are: 23 29 31 37.
there are 50 prime numbers between 1-100 and of them 2,3,5,7 are single digit so that would leave 46 double digit prime numbers between 1-100
There are 21 prime numbers between 100-200.
there are 12 prime numbers between 21 and 72 23, 29, 31, 37, 41, 43, 47, 49, 53, 59, 61, 67
21/71 is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.
21/3 is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.
Exploration task: Inserting rational numbers between two given rational numbers 1. Take any two rational numbers. 2. Add them. 3. Divide the result obtained by 2. 4. Observe the number obtained. Is the answer a rational number? Is it between two given numbers? Brainstorming: How many rational numbers can be inserted between two rational numbers?
there are 39 whole numbers between 21 and 61
Four. The prime numbers between 10 and 21 are 11, 13, 17, and 19.
Two.
All of the natural numbers are rational, but there are still more rational numbers that aren't natural ones. Example: 1, 2, 3, 4, and 5 are all natural numbers, and they're all rational. 11/2, 21/2, 31/2, 41/2, and 51/2 are also rational, but they're not natural numbers.
Infinitely many. In general, between ANY two DIFFERENT numbers, there are infinitely many other numbers.
ANY number that you can write as a fraction (with whole numbers top and bottom) is rational.
There are 2 primes between 21 and 29 inclusive: 23 & 29.
Three numbers between 21 seconds and 22 seconds are 21.1 sec, 21.2 sec, and 21.3 sec
45