1) 20 + 10 = 2) 40 - 20 = 3) 10 + 6 = 4) 1 + 1 = 5) 8 - 2 = 6) 10 + 90 = 7) 100 - 90 = 8) 10 - 5 = 9) 15 + 5 = 10) 30 + 20 = 11) 40 + 50 = 12) 12 + 6 = 13) 20 - 5 = 14) 8 + 8 =

select one box and do the maths

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