2 39% P1 process to find proportion of group that are students , e.g. P1 complete process to find the % of girls , e.g. A1 for 39(.0625) OR P1 process to scale up the ratio of teachers : students, so that students can be divided by 7+5 (=12),, e.g. 1 × 12 : 15 × 12 = 12 : 180 or a process to divide the in the ratio 7:5,, “180” e.g. 180 ÷ 12 × 7 (=105) and 180 ÷ 12 × 5 (=75) P1 complete process to find the % of girls , e.g. (75 ÷ (12+105+75)) × 100 A1 for 39(.0625) 3 B2 correct construction showing all necessary arcs. construction (B1) (pair of intersecting arcs centred on and A B) 4 (a) & 3.2 B2 for both roots correct –1.2 (B1) (for one correct root) (b) (1, B1 cao –5)
2 39% P1 process to find proportion of group that are students , e.g. P1 complete process to find the % of girls , e.g. A1 for 39(.0625) OR P1 process to scale up the ratio of teachers : students, so that students can be divided by 7+5 (=12),, e.g. 1 × 12 : 15 × 12 = 12 : 180 or a process to divide the “180” in the ratio 7:5,, e.g. 180 ÷ 12 × 7 (=105) and 180 ÷ 12 × 5 (=75) P1 complete process to find the % of girls , e.g. (75 ÷ (12+105+75)) × 100 A1 for 39(.0625) 3 construction B2 correct construction showing all necessary arcs. (B1) (pair of intersecting arcs centred on A and B) 4 (a) –1.2 & 3.2 B2 for both roots correct (B1) (for one correct root) (b) (1, –5) B1 cao
gcse_1ma1_mark_scheme_2h__mock_set_2_.docx