Foundation June 2017 Paper 3 Q11
11 A television channel shows 12 minutes of adverts in each half hour.
How many minutes of adverts does it show from 5 am to 11 pm? [3 marks]
| Answer | Mark | Comments |
|---|---|---|
| Alternative method 1 | ||
| 18 (hours) or 36 (half hours) or 24 (minutes per hour) | B1 | their hours \(\times 2 \times 12\) implies 24 |
| \(18 \times 2 \times 12\) or \(18 \times 24\) or their hours \(\times 2 \times 12\) or their hours \(\times 24\) or \(36 \times 12\) or their half hours \(\times 12\) | M1 | oe |
| 432 | A1 | Ignore fw in an attempt to convert 432 minutes to hours and minutes |
| Alternative method 2 | ||
| Build up method using 12 minutes or 24 minutes with at least three additions | M1 | |
| 36 additions using 12 minutes or 18 additions using 24 minutes | M1dep | |
| 432 | A1 | Ignore fw in an attempt to convert 432 minutes to hours and minutes |
Additional guidance
| 7 hours 12 minutes with 432 in working | B1M1A1 |
| 7.2 hours or 7 hours 20 minutes with 432 in working | B1M1A1 |
| 18 hours \(18 \div 2 = 9\) (half hours) \(9 \times 12\) 108 | B1M1A0 |
| 7 hours 12 minutes without 432 in working | B1M1A0 |
| 7.2 hours without 432 in working | B1M1A0 |
| their hours \(\times 2 \times 12\) implies 24 eg 2 2 2 2 2 2 (6 hours, 12 half hours)) \(\quad 12 \times 12\) \(\quad\) 144 | B1M1A0 |
| Condone division of their number of hours by 2 to imply an attempt to calculate their number of half hours eg 10 hours \(10 \div 2 = 5\) (half hours) \(5 \times 12\) 60 | B0M1A0 |