Basic Calculation: 09

(1)  499² = [{(499 - 1) ÷ 2} x 1000] + 1² = [249 x 1000] + 001 = 249,001

(2)  498² = [{(498 - 2) ÷ 2} x 1000] + 2² = [248 x 1000] + 004 = 248,004

(3)  497² = [{(497 - 3) ÷ 2} x 1000] + 3² = [247 x 1000] + 009 = 247,009

(4)  496² = [{(496 - 4) ÷ 2} x 1000] + 4² = [246 x 1000] + 016 = 246,016

(5)  495² = [{(495 - 5) ÷ 2} x 1000] + 5² = [245 x 1000] + 025 = 245,025

(6)  494² = [{(494 - 6) ÷ 2} x 1000] + 6² = [244 x 1000] + 036 = 244,036

(7)  493² = [{(493 - 7) ÷ 2} x 1000] + 7² = [243 x 1000] + 049 = 243,049

(8)  492² = [{(492 - 8) ÷ 2} x 1000] + 8² = [242 x 1000] + 064 = 242,064

(9)  491² = [{(491 - 9) ÷ 2} x 1000] + 9² = [241 x 1000] + 081 = 241,081