Abacus Small Friend Rule

44

55

-80

• 13

• 14

• 24

11

12

16

• 39

• 48

• 38

33

-12

11

• 32

• 31

• 22

45

-15

-20

• 10

• 20

• 5

Small Friend Rule of -4

• -5+1

• +5-1

Small Friend Rule of -3

• -5+2

• +5-2

Small Friend Rule of -2

• -5 +3

• +5-3

Small Friend Rule of -1

• -5+4

• +5-4

Small Friend Rule of +4

• +5-1

• -5+1

Small Friend Rule of +3

• +5-2

• -5+2