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Discussion in 'Mathematics' started by Null, Dec 18, 2011.
What age group are you working with?
Mental strategies would include rounding to multiples of 10 and adjusting e.g when adding 19. Also by bridging to multiples of 10 e.g. 26 + 15 add 4 first to bridge to 30, then add 10 then 1 or 11.) Using near doubles would be another mental strategy to add 37 and 36 for example. Then the simplest mental method to partition e.g. 37 + 25 = 37 + 20 + 5 This is the number line method used as a mental strategy. i don't like the straight partitioning method of 23 + 26 = 20 + 30 + 3 + 6. for me this is too many steps to remember. Written methods at year 4 would use vertiocal standard written method, but could include expaned written method as well. Merry Christmas
thank you all very much for this!