//小数点第1を四捨五入 BigNumber.set({ ROUNDING_MODE: BigNumber.ROUND_HALF_UP, DECIMAL_PLACES: 0}); new BigNumber(1.543).toString(10); // 2 //小数点第2を四捨五入 BigNumber.set({ ROUNDING_MODE: BigNumber.ROUND_HALF_UP, DECIMAL_PLACES: 1}); new BigNumber(1.543).toString(10); // 1.5 //小数点第1を切り捨て BigNumber.set({ ROUNDING_MODE: BigNumber.ROUND_DOWN, DECIMAL_PLACES: 0}); new BigNumber(1.543).toString(10); // 1 //小数点第2を切り上