胸算用 むなざんよう

muna zan yō

1. Not mental calculation.; Not calculating in one's head.

1. Was calculating in one's head.; Was doing mental arithmetic.

1. Rough estimate; Counting in one's head

1. Mental calculation; For mental calculation

1. It is not mental arithmetic.; It's not just figuring it out in my head.

1. It's not mental arithmetic.; I'm not calculating it in my head.

1. Used mental calculation.; Was using mental calculation.

1. Mental calculation.; Calculating in one's head.

1. Not mental calculation.; Is not done by mental calculation.

1. Wasn't calculating in one's head.; Didn't do mental math.

1. Probably calculated mentally.; Likely estimated.

1. Was not calculated mentally.; Was not done by mental arithmetic.

1. Wasn't calculating in my head.; Didn't do mental math.

1. Probably.; Likely.

1. Was not mental calculation.; Was not done in one's head.

1. If/when calculating in one's head; If/when doing mental math

1. If calculations are done mentally; If one calculates in one's head

1. If calculating in one's head; If mentally calculating