4MA0 Foundation January 2014 Paper 2 Q20
20 Express 825 as a product of its prime factors.
(3)
| Scheme | Marks |
|---|---|
| Fully correct factor tree or repeated division to reach prime factors (condone 1’s) or 3, 5, 5, 11 or 3 × 5 × 5 × 11 × 1 | M2 |
| 3 × 5 × 5 × 11 | A1 |
| (3) | |
| (Total 3 marks) |
Notes
M2: factors must multiply to 825
If not M2 then award M1 for correct but incomplete factor tree/ division ladder which includes 2 different primes. (e.g. 25 × 3 × 11)
A1: cao Accept \(3 \times 5^2 \times 11\) and dots in place of × signs