Here are some equations that are true when x=3 and y=4 but there is at least one mistake. Click on the ticks and crosses to show this piece of work correctly marked.
x + y = 7 
x  y = 1 
y  x = 1 
2x + 3y = 18 
5x  2y = 7 
4y  x = 13 
xy  10 = 2 
180  2x + y = 178 
20x  3xy = 33 
x^{2} + y = 13 
10x  y^{2} = 25 
y^{2}  x^{2} = 7 
x^{2}y + 13 = 62 
x^{2}y^{2}  2x = 138 
x^{2}y^{3} = 591 
x! + y = 10 
5(x + y) = 52 
3y รท x = 4 
xy
2
= 6

84
xy
= 7

15y
5x
= y



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Numeracy"Numeracy is a proficiency which is developed mainly in Mathematics but also in other subjects. It is more than an ability to do basic arithmetic. It involves developing confidence and competence with numbers and measures. It requires understanding of the number system, a repertoire of mathematical techniques, and an inclination and ability to solve quantitative or spatial problems in a range of contexts. Numeracy also demands understanding of the ways in which data are gathered by counting and measuring, and presented in graphs, diagrams, charts and tables." Secondary National Strategy, Mathematics at key stage 3 

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