@lennar0719 , I assume that this was your mother's IRA and not an inherited IRA maintained for her as beneficiary of someone else's IRA.
The RMDs in years 1 through 9 are to be calculated using the factor from the Single Life Expectancy table for your age attained in 2021, reduced by 1 each subsequent year. Any amount that remains in year 10 must be distributed by the end of year 10. (As Opus 17 has said, the IRS waived the penalty for failing to take these annual RMDs in 2021 and 2022,)
