268
1) Since we need to find which number fits into that expression:
________+ 308 -126 = 450
We can place an x, and rewrite it:
x +308 -126 = 450
x + 182 = 450 subtract 182 from both sides
x = 450 -182
x =268
2) Hence, the missing number is 268
5.9m questions
7.8m answers