31 and 3
31*43 = 74
If by "equal up" you mean add up, there are at least two answers: (3, 7, 13, 31) and (5, 7, 11, 31).
31 x 5 150 + 5 160 - 5 775 ÷ 5
What you are trying to say is "What is the square root of 31?" Well the answer is "undefined" because the square root is not a whole number.
31 and 2
31
23, 31
31 and 3
How about: 31+7 = 38
31*43 = 74
They are 31 plus 61 = 92
29 + 2 is equal to 31. Both 29 and 2 are prime.
181
1 x 21979 and 31 x 709
155 is equal to 31 x 5.
Yes. Mixed numbers can be negative. -11/2 + 31/2 = 2