29+90

Solution (adapted for English, 7th grade understanding): Problem: 29 + 90 Goal: understand the steps clearly 1) Break it into place values - 29 has tens (2) and ones (9) - 90 has tens (9) and ones (0) - So we can add tens and ones separately: (2 + 9) tens and (9 + 0) ones 2) Add by decomposition - 29 = 20 + 9 - 90 = 90 - Sum = (20 + 90) + 9 = 110 + 9 = 119 3) Column addition (check with standard method) 29 + 90 ---- 119 - Units: 9 + 0 = 9 - Tens: 2 + 9 = 11 → write 1 in tens place and carry 1 to the hundreds - Result: 119 4) Quick mental math check - Think of 29 as 30 − 1: 90 + 30 = 120; subtract 1 → 119 Answer: 119 If you’d like, I can also provide a Russian version or more practice problems with similar steps.