anzan
1. mental arithmetic
Noun
#90065
1. mental arithmetic
1. Calculating mentally; In one's head
1. Mental calculation; Calculated
1. Mental calculation; Calculating in one's head
1. If it were mental calculation; If calculating mentally
1. Was mental calculation.; Was calculated in one's head.
1. If/when calculating in one's head; If/when mental calculation
1. Not mental calculation.; Not calculating in one's head.
1. If it were mental calculation; If calculating mentally
1. Probably mental calculation.; Likely a rough estimate.