39.5 or 24.5 or 40.5 or 25.5 or B1 965 or 975 eg 39.5 × 24.5 = 967(.75) One correctly evaluated using at or 39.7 × 24.5 = 972(.65) or least one bound M1 or one correctly evaluated giving 40.5 × 25.5 = 1032(.75) an answer in range 965 to 975 values must be in range of bounds Ticks cannot tell and 965 seen and One correctly evaluated trial giving an answer in range 965 to 970 or A1 eg 967.75 Ticks cannot tell and 975 seen and One correctly evaluated trial giving an answer in range 970 to 975 eg 972.6 Alternative method 2 One correctly evaluated giving an answer below 970 M1 19 (or their value [965, 975]) cont.
39.5 or 24.5 or 40.5 or 25.5 or 965 or 975 B1 One correctly evaluated using at least one bound or one correctly evaluated giving an answer in range 965 to 975 M1 eg 39.5 × 24.5 = 967(.75) or 39.7 × 24.5 = 972(.65) or 40.5 × 25.5 = 1032(.75) values must be in range of bounds Ticks cannot tell and 965 seen and One correctly evaluated trial giving an answer in range 965 to 970 or Ticks cannot tell and 975 seen and One correctly evaluated trial giving an answer in range 970 to 975 A1 eg 967.75 eg 972.6 19 cont. Alternative method 2 One correctly evaluated giving an answer below 970 (or their value [965, 975]) M1