Question 201354This question is from textbook Mathematics
: Solve the following problems using the Russian peasant algorithm 25 X 17 48 X 39 and 120 X 42
This question is from textbook Mathematics
Answer by RAY100(1637)   (Show Source):
You can put this solution on YOUR website! 25 * 17
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12,,,,34,,,,,even(12), not add
6,,,,,68,,,,,even (6), not add
3,,,,,136
1,,,,,272
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,,,,,,408 (136 + 272) ,,,,,close to 425
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48 * 39
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24,,,,,78, even(24), not add
12,,,,,156, even(12), not add
6,,,,,,312, even(6), not add
3,,,,,,624,
1,,,,,,1248
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,,,,,,,1872,,(624 +1248),,,,exactly 1872
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120 * 42
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60,,,,,,84, even (60), not add
30,,,,,168, even(30), not add
15.,,,,336
7,,,,,,672
3,,,,,1344
1,,,,,2688
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,,,,,,5040,,,,(336+672+1344+2688),,,exactly 5040
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again, first column divide by 2,(drop remainders),,second column multiply by two. Cross out even numbers in first column , and mates in second column. Then add remaining second column.
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