21회 5 급 승 산 5 급 제 산 1 2,750 × 45 = 123,750 1 17,958 ÷ 438 = 41 2 710 × 217 = 154,070 2 66,080 ÷ 80 = 826 3 84 × 7,053 = 592,452 3 11,913 ÷ 209 = 57 4 458 × 640 = 293,120 4 19,758 ÷ 37 = 534 5 7,239 × 81 = 586,359 5 16,366 ÷ 167 = 98 6 163 × 852 = 138,876 6 8,865 ÷ 45 = 197 7 60 × 4,819 = 289,140 7 32,200 ÷ 805 = 40 8 709 × 419 = 297,071 8 4,632 ÷ 12..