Create better lessons quicker
20 = 10 + ? - 10, 12 + ? = 20 - 8, 5 + ? = 20 - 15, 20 = 19 + ? - 1, 20 = ? + 3 - 17, 18 + ? = 20 - 2, ? + 4 = 20 - 16, 20 = ? + 6 - 14, 20 = 13 + ? - 7, 9 + ? = 20 - 11, 20 + ? = 20 - 0, 20 = ? + 17 - 3, 15+ ? = 20 - 5, 8 + ? = 20 - 12, 20 = ? + 11 - 9, 20 = ? + 14 - 6,

number bonds to 20

by Head18

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