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2144                                                                 ARITHMETIC

The following chart gives every possible combination of the digits .-

\ i     i      i      i      i      i      i      i      i 7

\ 1       -£        .1        JL       JL       .£,       JL       JL       JL/

\   2        2       2       2       a       2        2       2    /

\JL     1-      -±      i      £      £       JL      £./

\3    3     3     3     3     3     3    /

\A      J±        5. J^      21       Jl       JL/

\4    ^     -4     -4     4-     4/

\±    ^.     JL     Z     ^     A/

\   5       5      5      S      S   /

\JL       JL      JL       ^       JL/

\   6      6      6      6    /

\J. JL       ^. JL/

\r      r        r/

\     ~      V

\   8      8    /

\^    ^/

\.7 -v

For rapid work in addition. Let the teacher write any number in the center circle. Pupils should promptly give the sum of the center figure and one of the outer figures to which the teacher may point.

Change the center figpire often.