Top tip for Level 8 and 9 students

Everybody is expected to recognise first 12 square numbers: 1,4,9,16...

but top flight students need to go a little further!

13X13= 169 (think 3X13=39)

14X14= 196 (think the same as above with the two last digits swapped)

15X15=225 (think 1.5 X1.5 =2.25, ie 1.5 + 0.75)

enjoy!

...and there are 5 more...

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