computation - subtraction Pamela Leutwyler
base ten example The same algorithm will be used in other bases
hundreds tens ones 1 3 4 - 7 8
hundreds tens ones 1 3 4 - 7 8
hundreds tens ones 1 3 4 - 7 8
hundreds tens ones 1 3 4 - 7 8 remove 8 pebbles
hundreds tens ones 1 3 4 - 7 8 remove 8 pebbles borrow
hundreds tens ones 1 2 3 4 - 7 8 1 remove 8 pebbles borrow
hundreds tens ones 1 2 3 4 - 7 8 1 remove 8 pebbles
hundreds tens ones 1 2 3 4 - 7 8 6 1
hundreds tens ones 1 2 3 4 - 7 8 6 1
hundreds tens ones 1 2 3 4 - 7 8 6 1 remove 7
hundreds tens ones 1 2 3 4 - 7 8 6 1 remove 7 borrow
hundreds tens ones 1 2 3 4 - 7 8 6 1 remove 7 borrow
hundreds tens ones 1 2 3 4 - 7 8 6 1 1 remove 7 borrow
hundreds tens ones 1 2 3 4 - 7 8 6 1 1 remove 7
hundreds tens ones 1 2 3 4 - 7 8 6 1 1 remove 7
hundreds tens ones 1 2 3 4 - 7 8 5 6 1 1
hundreds tens ones 1 2 3 4 - 7 8 5 6 1 1
base five example
twenty fives fives ones 1 3 15 - 4 35
twenty fives fives ones 1 3 15 - 4 35
twenty fives fives ones 1 3 15 - 4 35
twenty fives fives ones 1 3 15 - 4 35 remove 3 pebbles
twenty fives fives ones 1 3 15 - 4 35 remove 3 pebbles borrow
1 2 3 15 - 4 35 1 remove 3 pebbles twenty fives fives ones base 5
1 2 3 15 - 4 35 11 6 Think in base 10 6 1 remove 3 pebbles twenty fives fives ones 1 2 3 15 - 4 35 base 5 base 10 11 6 6 1 remove 3 pebbles
twenty fives fives ones 1 2 3 15 - 4 35 6 1 remove 3 pebbles
twenty fives fives ones 1 2 3 15 - 4 35 6 1
twenty fives fives ones 1 2 3 15 - 4 35 6 1 remove 4
twenty fives fives ones 1 2 3 15 - 4 35 6 1 remove 4 borrow
twenty fives fives ones 1 2 3 15 - 4 35 6 1 remove 4 borrow
twenty fives fives ones 1 2 3 15 - 4 35 1 6 1 remove 4 borrow
1 2 3 15 - 4 35 11 6 12 7 7 1 6 1 remove 4 twenty fives fives ones base 5 base 10 11 6 12 7 7 1 6 1 remove 4
1 2 3 15 - 4 35 11 6 12 7 7 1 6 1 remove 4 twenty fives fives ones base 5 base 10 11 6 12 7 7 1 6 1 remove 4
1 2 3 15 - 4 35 11 6 12 7 7 1 6 1 remove 4 twenty fives fives ones base 5 base 10 11 6 12 7 7 1 6 1 remove 4
1 2 3 15 - 4 35 11 6 12 7 7 1 6 1 twenty fives fives ones base 5
1 2 3 15 - 4 35 11 6 12 7 7 1 6 1 twenty fives fives ones base 5