Published at Friday, 06 September 2019. addition worksheet. By Nathalie Perrot.
The best kind of abacus has each five beads in alternating colors, like the abacus from Schelling you see on the right.
Imagine instead a child who has learned to visualize numbers as organized groups on ten-frames. Here are those same 9 and 4 counters organized on ten-frames.
Pairs that make 10 (dark coral)
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