24 14:21:42 P1 for 2 out of 3 expressions in one letter eg from 2x+14 or see a set of numbers x, x+7 to show interpretation of the relationships, eg 10, 17, 34 P1 (dep) for sum of their 3 expressions =77 eg + =77 oe or 2 systematic x x+7+2x+14 correct trials including addition P1 for a correct process to isolate their term in or x x=14 A1 for ratio 14:21:42 oe Paper 1MA1: 1F Question Working Answer Mark Notes 25 extended to form Reasoning B1 for 35 or 75 or 145 or 105 or = 70, marked on the diagram or 3 letter CB CG DEF description M1 for or or a correct pair of angles that would lead to 75 or 70, 180−70−35 180−75−35 eg = 35 and = 75 or = 35 and = 75 or AFB FAB AFB ABG = 35 and = 75 or = 75 and = 70 or = 105 and = 35 or FBC ABG EDF DEF FDC FBC = 105 and = 35 ABC FBC C2 (dep on B1M1) All figures correct with all appropriate reasons stated. Angles must be clearly labelled or on the diagram. Full solution must be seen (C1 (dep on B1 or M1) for one reason clearly used and stated.) Corresponding angles are equal, alternate angles are equal, opposite angles in a parallelogram are equal, angles in a triangle sum to 180, angles on a straight line sum to 180, vertically opposite angles are equal, vertically opposite angles are equal,
24 14:21:42 P1 for 2 out of 3 expressions in one letter eg from x, x+7 2x+14 or see a set of numbers to show interpretation of the relationships, eg 10, 17, 34 P1 (dep) for sum of their 3 expressions =77 eg x + x+7+2x+14 =77 oe or 2 systematic correct trials including addition P1 for a correct process to isolate their term in x or x=14 A1 for ratio 14:21:42 oe Paper 1MA1: 1F Question Working Answer Mark Notes 25 CB extended to form CG Reasoning B1 for 35 or 75 or 145 or 105 or DEF = 70, marked on the diagram or 3 letter description M1 for 180−70−35 or 180−75−35 or a correct pair of angles that would lead to 75 or 70, eg AFB = 35 and FAB = 75 or AFB = 35 and ABG = 75 or FBC = 35 and ABG = 75 or EDF = 75 and DEF = 70 or FDC = 105 and FBC = 35 or ABC = 105 and FBC = 35 C2 (dep on B1M1) All figures correct with all appropriate reasons stated. Angles must be clearly labelled or on the diagram. Full solution must be seen (C1 (dep on B1 or M1) for one reason clearly used and stated.) Corresponding angles are equal, alternate angles are equal, opposite angles in a parallelogram are equal, angles in a triangle sum to 180, angles on a straight line sum to 180, vertically opposite angles are equal, vertically opposite angles are equal,
02b_1ma1_1f_-_november_2017_mark_scheme.docx