 The number of grains of wheat on the first half of the chessboard is , for a total of 4,294,967,295 (232 − 1) grains, or about 279 tonnes of wheat (assuming 65 mg as the mass of one grain of wheat).The number of grains of wheat on the "second" half of the chessboard is , for a total of 264 − 232 grains.This is equal to the square of the number of grains on the first half of the board, plus itself.