The usefulness of low/adaptive precision is mainly discussed in deep learning to reduce computational time and power consumption. Low/adaptive precision accelerates computations by improving computational performance per flop or reducing data transfer. In order to use low/adaptive precision in computer simulations, it is also necessary to discuss the impact of decreased computation accuracy. This talk discusses the use of low/adaptive precision on an ICCG iterative method by evaluating an impact on a convergence rate and reducing computational time.