1. The problem is to multiply the given pairs of numbers: (12) 235 \times 724, (14) 1703 \times 53, (13) 1386 \times 35, (11) 760 \times 57. 2. Multiply each step by step: - For (12) 235 \times 724: $$235 \times 724 = 235 \times (700 + 20 + 4) = 235 \times 700 + 235 \times 20 + 235 \times 4$$ $$= 164500 + 4700 + 940 = 170140$$ - For (14) 1703 \times 53: $$1703 \times 53 = 1703 \times (50 + 3) = 1703 \times 50 + 1703 \times 3$$ $$= 85150 + 5109 = 90259$$ - For (13) 1386 \times 35: $$1386 \times 35 = 1386 \times (30 + 5) = 1386 \times 30 + 1386 \times 5$$ $$= 41580 + 6930 = 48510$$ - For (11) 760 \times 57: $$760 \times 57 = 760 \times (50 + 7) = 760 \times 50 + 760 \times 7$$ $$= 38000 + 5320 = 43320$$ 3. Final answers: - $235 \times 724 = 170140$ - $1703 \times 53 = 90259$ - $1386 \times 35 = 48510$ - $760 \times 57 = 43320$