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Addition

· Formula

🧮 Formula Reference Sheet

Sum:  a + b = b + a   (commutative)
Group: (a + b) + c = a + (b + c)  (associative)
Zero: a + 0 = a   (identity)
Carry over: 27 + 18 → 7+8=15 (write 5 carry 1) → 2+1+1=4 → 45

⚡ Example per formula

Sum: a + b = b + a (commutative)

17 + 25 = 42 (carry 1)

Group: (a + b) + c = a + (b + c) (associative)

(2+3)+4 = 2+(3+4) = 9

Zero: a + 0 = a (identity)

47 + 0 = 47

Carry over: 27 + 18 → 7+8=15 (write 5 carry 1) → 2+1+1=4 → 45

27 + 18 → 7+8=15 (carry) → 4+1+1 = 45

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