PB 60 +0 to 20
PB 61 +1 to 20
PB 62 +Doubles to 20
PB 63 +Doubles +1 to 20
PB 64 Rev #13 +0, 1, Dbls to 20
PB 65 -0 from 20
PB 66 -1 from 20
PB 67 -Itself & Doubles from 20
PB 68 Rev #14 -0,1,Dbls: 20
PB 69 Rev #15 COMB 0,1,Dbls: 20
PB 70 +10 to 20
PB 71 +Nifty Nines to 20
PB 72 +11 to 20
PB 73 Rev #16 +10,9,11 to 20
PB 74 -10 from 20
PB 75 -9 from 20
PB 76 -11 from 20
PB 77 Rev #17 -10,9,11: 20
PB 78 Rev#18 COMB 10,9,11: 20
PB 79 +2 to 20
PB 80 +3 to 20
PB 81 +4 to 20
PB 82 Rev #18 +2,3,4 to 20
PB 83 -2 from 20
PB 84 -3 from 20
PB 85 -4 from 20
PB 86 Rev #20 -2,3,4 from 20
PB 87 Rev #21 COMB 2,3,4: 20
PB 88 +5 to 20
PB 89 +6 to 20
PB 90 Rev #22 +5,6 to 20
PB 91 -5 from 20
PB 92 -6 from 20
PB 93 Rev #23 -5,6 from 20
PB 94 Rev #24 COMB 5,6: 20
PB 95 +7 to 20
PB 96 +8 to 20
PB 97 Rev #25 +7, 8, to 20
PB 98 -7 from 20
PB 99 -8 from 20
PB 100 Rev #26 -7,8 from 20
PB 101 Rev #27 COMB 7,8: 20
PB 102 Quiz: Add & Sub to 20
PB 60 Strategy Help
PB 61 Strategy Help
PB 62 Strategy Help
PB 63 Strategy Help
PB 64 Strategy Help
PB 65 Strategy Help
PB 66 Strategy Help
PB 67 Strategy Help
PB 68 Strategy Help
PB 70 Strategy Help
PB 71 Strategy Help
PB 73 Strategy Help
PB 74 Strategy Help
PB 75 Strategy Help
PB 76 Strategy Help
PB 77 Strategy Help
PB 79 Strategy Help
PB 80 Strategy Help
PB 81 Strategy Help
PB 83 Strategy Help
PB 84 Strategy Help
PB 89 Strategy Help
PB 90 Strategy Help
PB 91 Strategy Help
PB 98 Strategy Help
PB 100 Strategy Help