Revision as of 20:05, 10 January 2014 edit 46.64.255.189 (talk) →Clarification of which column to add ← Previous edit		Revision as of 20:06, 10 January 2014 edit undo 46.64.255.189 (talk) →Clarify which column to add up Next edit →
Line 173: * 2 is halved (1) and 12 is doubled (24). * All not-scratched-out values IN THE RIGHT-HAND COLUMN are summed: 3 + 6 + 24 = 33. The point is to sum any value in the "~~halving~~doubling" column every time there's an odd number in the "halving" column. The method works because multiplication is [[distributivity\|distributive]], so:

Multiplication algorithm: Difference between revisions