17X18=306
There are no two consecutive integers whose product is 421 - the product of 20 and 21 is 420.
2 and 3 are the only consecutive numbers that are prime.
There are two consecutive even integers. The numbers are 118 and 120.
9 and 11
This is easiest to solve by trial-and-error. Take two consecutive numbers and multiply them, for example, 20 x 21 = 420. Since this is too low, try higher numbers. If your answer is too high, try again with lower numbers, until you find the answer.
There are two consecutive even numbers: 4,752 and 4,754.
Consecutive numbers will always total an odd number. Consecutive odd numbers or consecutive primes would be 5 and 7.
420
You can write a simple equation: x + (x+1) = 420, where x is the first number. Alternatively, you can make x the second number and write x + (x - 1) = 420. Using the first one, x + x + 1 = 420, so 2x + 1 = 420. 2x = 419 (subtract 1), so x = 209.5. You can check this answer: 209.5 + 210.5 = 420.
17X18=306
There are two consecutive even numbers. The numbers are 62 and 64.
There are two consecutive even numbers. The numbers are 26 and 28.
There are two consecutive even numbers. The numbers are 92 and 94.
The numbers are 24 and 25.
The numbers are 13 and 14.
The numbers are 24 and 25.