with subtraction, viewed as a 'gap', you can always shift it along to a more convenient location on a number line
Wednesday, 20 February 2019
directed number addition and subtraction 2 (of 2)
the powerpoint is here
with subtraction, viewed as a 'gap', you can always shift it along to a more convenient location on a number line
add (or subtract) the same amount to both keeps the sum the same
looking at sequences/patterns to decide what the results should be
with subtraction, viewed as a 'gap', you can always shift it along to a more convenient location on a number line
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