*Relearning to Teach Arithmetic, Susan Jo Russell.
1999.
Also, the recording of the numbers is to explain how they solved the problem and can look
tedious.
Multiplication by breaking numbers apart* (using landmarks)
12 x 1410 x 14 = 1402 x 14 = 28140 + 28 = 168Multiplying each place, starting with the largest place* (related to the traditional partial product algorithm)29 x 4 29 x 1220 x 4 = 80 20 x 12 = 2409 x 4 = 36 9 x 12 = (9 x 10) + (9 x 2) = 90 + 18 = 10880 + 36 = 116 240 + 108 = 348Breaking up one of the numbers into parts that are easier to multiply* (landmarks other than 10’s)29 x 4 128 x 32(25 x 4) + (4 x 4) (125 ...
Allowed
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