Pamela Leutwyler Each set of 10 pebbles must be replaced with 1 pebble in the next pile. Examine the familiar base 10 algorithm. Addition in other bases.

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Presentation transcript:

Pamela Leutwyler

Each set of 10 pebbles must be replaced with 1 pebble in the next pile. Examine the familiar base 10 algorithm. Addition in other bases works the same way. Base 10 pebble board rule:

Base 10

78 +96

78 +96

Each set of 10 pebbles must be replaced with 1 pebble in the next pile.

Base 10 Each set of 10 pebbles must be replaced with 1 pebble in the next pile.

Base 10 Each set of 10 pebbles must be replaced with 1 pebble in the next pile. 1 Put down 4 Carry 1

Base 10 Each set of 10 pebbles must be replaced with 1 pebble in the next pile. 1

Base 10 Each set of 10 pebbles must be replaced with 1 pebble in the next pile. 1

Base 10 Each set of 10 pebbles must be replaced with 1 pebble in the next pile. 1

Base 10 Each set of 10 pebbles must be replaced with 1 pebble in the next pile. 1 1

Base

Each set of 5 pebbles must be replaced with 1 pebble in the next pile. Base 5 pebble board rule:

Base

Each set of 5 pebbles must be replaced with 1 pebble in the next pile

Base 5 Each set of 5 pebbles must be replaced with 1 pebble in the next pile

Base 5 Each set of 5 pebbles must be replaced with 1 pebble in the next pile

Base 5 Each set of 5 pebbles must be replaced with 1 pebble in the next pile

Base 5 Each set of 5 pebbles must be replaced with 1 pebble in the next pile

Base 5 Each set of 5 pebbles must be replaced with 1 pebble in the next pile

Base 5 Each set of 5 pebbles must be replaced with 1 pebble in the next pile

Base 5 Each set of 5 pebbles must be replaced with 1 pebble in the next pile

Base 5 Each set of 5 pebbles must be replaced with 1 pebble in the next pile