| Almost every day, including weekends: 628 (19.7%) |  |
| Almost every working day: 360 (11.3%) | |
| A few times a week: 638 (20.0%) | |
| About once a week: 201 (6.3%) | |
| A few times a month: 315 (9.9%) | |
| About once a month: 147 (4.6%) | |
| A few times a year: 261 (8.2%) | |
| About once a year: 44 (1.4%) | |
| A few times since I left school: 237 (7.4%) | |
| Once or twice since I left school: 107 (3.4%) | |
| Never since I left school: 195 (6.1%) | |
| I've never used algebra, ever: 54 (1.7%) | |
