Create better lessons quicker
1+2 - 3, 3+9 - 12, 7+2 - 9, 8+5 - 13, 5+6 - 11, 6+9 - 15, 1+2 - 3, 9+2 - 11, 1+7 - 8, 7+3 - 10, 9+6 - 15, 2+2 - 4, 1+5 - 6, 2+4 - 6, 7+6 - 13, 3+7 - 10, 5+5 - 10, 3+8 - 11, 5+6 - 11, 2+5 - 7,

Addition to 20

by Karenclayton

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