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1.13 Addition and subtraction: two-digit and single-digit numbers

Created on 08 March 2018 by ncetm_administrator
Updated on 26 November 2018 by ncetm_administrator


Build on segments 1.8, 1.9 and 1.10 to equip children with useful strategies for addition and subtraction of a single-digit number to/from two-digit numbers.

Teaching points

  • Teaching point 1: Knowledge of the number line, and quantity values of numbers, can be applied to add/subtract one to/from a given two-digit number.
  • Teaching point 2: Known facts for the numbers within ten can be applied to addition/subtraction of a single-digit number to/from a two-digit number.
  • Teaching point 3: Knowledge of numbers which sum to ten can be applied to the addition of a single-digit number and two-digit number that sum to a multiple of ten, or subtraction of a single-digit number from a multiple of ten.
  • Teaching point 4: Known strategies for addition or subtraction bridging ten can be applied to addition or subtraction bridging a multiple of ten.




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23 April 2020 11:28
using known facts to add and subtract is this the same as using rounding and adjusting e.g. 17 add 4 they known 17 add 3 is 20 then just add one
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