Oh honey, that's just a simple pattern of squares. The missing number is 16 because 1 squared is 1, 2 squared is 4, 3 squared is 9, and 4 squared is 16. It's basic math, darling.
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It seems to be 16
36
The missing number is 49. This is why: 1 plus 2 equals 3, then 3 squared is 9. 2 plus 3 equals 5, then 5 squared is 25. Therefore, the missing number must be 49 to make the number sentence (3 plus 4 equals 7, then 7 squared is 49) true.
These are squares. 12 = 1 22 = 4 32 = 9 (it is missing 42 = 16) 52 = 25 62 = 36 The next one in the series is probably 72 = 49.
Each part equals -19. 0-19=-19, 4-23=-19,...so 25-X=-19. This means 25+19=X, so the missing number is 25+19 which is 44.