1) 37 * 218 + 63 * 218 = 218 * (37 + 63) = 218 * 100 = 21800
2) 568 * 43 - 566 * 43 = 43 * (568 - 566) = 43 * 2 = 86
3) 417 * 187 + 417 * 213 = 417 * (187 + 213) = 417 * 400 = 166800
4) 52 * 187 - 43 * 52 - 52 * 44 = 52 * (187 - 43 - 44) = 52 * 100 = 5200