1) How much more to reach 20? a) 4 b) 5 c) 2 2) How much more to reach 20? a) 1 b) 2 c) 3 3) How much more to reach 20? a) 4 b) 5 c) 6 4) How much more to reach 20? a) 15 b) 12 c) 8 5) How much more to reach 20? a) 6 b) 7 c) 5 6) How much more to reach 20? a) 3 b) 4 c) 2 7) How much more to reach 20? a) 12 b) 18 c) 17 8) How much more to reach 20? a) 10 b) 11 c) 12 9) How much more to reach 20? a) 12 b) 13 c) 8 10) How much more to reach 20? a) 10 b) 12 c) 17 11) How much more to reach 20? a) 6 b) 7 c) 8 12) How much more to reach 20? a) 13 b) 14 c) 15 13) How much more to reach 20? a) 18 b) 17 c) 19 14) How much more to reach 20? a) 9 b) 12 c) 7

1-20 addition and subtraction with Cuisenaire rods

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