(a) Write one of the numbers 3, 5, 7, 9 in each box. Each number may be used only once. The sum of the numbers in the column must equal the sum of the numbers in the row. [1]
(b) Write a different multiple of 4 in each box to make this sum correct. [2]
+ + = 40
Mark scheme (a)
Scheme
Marks
Comments
3 opposite 9 AND 5 opposite 7
B1
Mark scheme (b)
Scheme
Marks
Comments
4, 8, 28 Or 4,12, 24 Or 4,16, 20 Or 8,12, 20
B2
The values in the boxes take precedence. The numbers can be written in any order. B1 for any three multiples of 4 which are all different but do not add up to 40 (e.g. 4, 12, 20) OR which are not all different but do add up to 40 (e.g. 8, 16, 16). If boxes empty, then give credit as above for unambiguous answers in working space.
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