Project Math Access DVD 02 - Abacus- Part 03
Transcript Start
Audio Description: Part three; abacus logic method; multiplication.
TEACHER: Okay, now we're going to continue with a multiplication problem.
PETER: Alright, and the problem is 46 * 253. So I'll set 46 all the way to the left.
TEACHER: And what is that?
PETER: 46 is your multiplier.
PETER: 46 is your multiplier.
TEACHER: multiplicand
PETER: I mean multiplicand.
TEACHER: Okay
PETER: And 253 I‘m going to set in the millions period. So 253, Alright, and we'll start by doing 40 * 200 is 8,000. And 8,000 according to where it would be set normally, so 8,000.
TEACHER: And you can do it directly.
PETER: And you can do it directly.
TEACHER: Okay
PETER: Now 6 * 200 is 1200. And we can set that directly as well, 1200. Alright, and now we can clear our 200. And 40 * 50 is uh,.. 40* 50 is 2,000.
TEACHER: umhum
PETER: And we cannot set 2,000 directly, so we'll have to set a 10,000 and clear 8,000, because it‘s 8,000 too many, so 8,000. Alright, and there‘s our 2,000. And now 6 * 50 is 300. Alright, and there‘s our 2,000. And now 6 * 50 is 300. which is 200 too many, so clear 200. And now we can clear our 50. And now 40 * 3 is 120, which we can set directly, so 120. And now6* 3 is 18, which we can set directly. And now clear 3 and you're done with everything in your multiplier, so you have your final answer which is eleven- thousand, six-hundred and thirty-eight (11,638). No and...
TEACHER: No and. What does “and" mean?
PETER: That there's a decimal and there's not a decimal in this problem.
TEACHER: So how do you read the answer?
PETER: eleven-thousand, six-hundred thirty-eight.