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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
✏️ Worked Example
34 + 28 = ?
👁 Show step-by-step solution
4 + 8 = 12 (write 2, carry 1) 3 + 2 + 1 = 6 → 62 ✅ Answer: 62
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