Look at the numbers in the grid and find: The smallest prime number Integers N1.1 Core Starter Look at the numbers in the grid and find: The smallest prime number Three consecutive numbers Two numbers whose sum is 154 The square root of 81 The column with the largest total Two numbers whose product is 48 A number divisible by 13 Two numbers with a difference of 23 Preamble A short, quick-fire activity, to which other questions may be added depending on the capability of the group. For example, which row has the smallest sum? Estimate the mean of the second row, etc. The questions could be answered one at a time using wipe boards – in this way any serious misconceptions will quickly become apparent. Alternatively, a time limit could be given in which pupil’s find as many answers as possible. There is also scope for some whole-class discussion based around any strategies pupil’s may have used. A possible homework task is for pupils to design their own grid with ten accompanying questions. Possible content Basic number facts and properties, and associated vocabulary. Resources Possibly wipe boards. Solution/Notes a) 2 b) 8, 9, 10; 12, 13, 14; 13, 14, 15; 24, 25, 26; c) 99 + 55; 130 + 24 d) 9 e) The last column (total = 817) f) 2 × 24; 4 × 12; 6 × 8 g) 13, 26, 39, 52, 78, 130 h) 25 – 2; 32 – 9; 37 – 14; 55 – 32; 60 – 37; 78 – 55 Original Material © Cambridge University Press 2009 Original Material © Cambridge University Press 2009