Maths KS3: Mental add and subtraction game Got it!
Last updated 27 March 2013, created 03 June 2011, viewed 989
From the set of 15 problems, originally created by NRICH, which link to a strand of mathematical processes and applications and to the sub-strands of content.
This is a motivating context in which learners can use their mental addition and subtraction skills. However, the real challenge is not the More…calculation but the search for a winning strategy that will always work. This involves conjecturing, refining ideas, generalising and using knowledge of factors and multiples to aid efficiency.