48 their 12 (= 4) M1 ÷ their addition of 3 + 4 + 5 ‘Their 12’ means or their total if they think that a pentagon does not have 5 sides 20 A1ft ft on B0 Accept 12 : 16 : 20 M1 if one expansion, sign or 12 2a + 2c = 5a 5b or rearrangement error on any line – 2a + 2c = 5(a b) 2c – = is OK if rest correct –2c M2 or = 5a 2a 5b 2c – – = 5(a 2a b) – – ft on one error Must have c = on answer line If question simplified by an incorrect 5b c A1ft expansion 2a + c to give c = (see … 2 exemplar below) then they must simplify their answer or equivalent expression Do not award if incorrect further work 12 Alt a + c = 2.5(a b) c = M1 if one expansion, sign or – M2 rearrangement error on any line 2.5(a b) a – – ft on one error = 2.5(a c b) a – – A1 ft Must have = on answer line c or equivalent expression Do not award if incorrect further work Q Answer Mark Comments 13(a) 20 B1 13(b) 9 B1 13(c) 11 and 3 seen M1 Could be written on diagram
48 ÷ their 12 (= 4) M1 ‘Their 12’ means their addition of 3 + 4 + 5 or their total if they think that a pentagon does not have 5 sides 20 A1ft ft on B0 Accept 12 : 16 : 20 12 2a + 2c = 5a – 5b or 2a + 2c = 5(a – b) 2c = 5a – 2a – 5b or 2c = 5(a – b) – 2a M2 M1 if one expansion, sign or rearrangement error on any line –2c = is OK if rest correct c 5b 2 or equivalent expression A1ft ft on one error Must have c = on answer line If question simplified by an incorrect expansion 2a + c to give c = … (see exemplar below) then they must simplify their answer Do not award if incorrect further work 12 Alt a + c = 2.5(a – b) c = 2.5(a – b) – a M2 M1 if one expansion, sign or rearrangement error on any line c = 2.5(a – b) – a or equivalent expression A1 ft ft on one error Must have c = on answer line Do not award if incorrect further work Q Answer Mark Comments 13(a) 20 B1 13(b) 9 B1 13(c) 11 and 3 seen M1 Could be written on diagram