Find ?: 3251 + 587 + 369 − ? = 3007

Given data

• Equation: 3251 + 587 + 369 − ? = 3007

Concept / Approach

• First sum the known addends; then solve for the unknown by transposition.

Step-by-step calculation

S = 3251 + 587 = 3838S = 3838 + 369 = 42074207 − ? = 3007 ⇒ ? = 4207 − 3007? = 1200

Verification / Alternative

Plug back: 3251 + 587 + 369 − 1200 = 4207 − 1200 = 3007 ✔

Common pitfalls

• Subtracting in the wrong order (3007 − 4207) or mis-adding 587 and 369.

Final Answer

1200