Add by Regrouping is mainly a power point is easy to follow in clear steps.
One, two and three digit addition is covered which also has regrouping or carrying tens and hundreds. These are colourful and show how to carry.
There is also 6 practice pages with answers and one challenge page for those who already understand.
one Power Point (25 pages)
One PDF for high definition printing
One JPEG folder of each slide for poster printing.
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75 which includes all three files