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Multiplication Lives

Multiplication Lives. Cuneiform tablet found in West Asia about 2700 BC The table helps people figure out the area of a region by multiplying width by length. The first column is the width, the second is the length, and the third column is the area.

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Multiplication Lives

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  1. Multiplication Lives

  2. Cuneiform tablet found in West Asia about 2700 BC • The table helps people figure out the area of a region by multiplying width by length. • The first column is the width, the second is the length, and the third column is the area. • It uses a system for writing down large numbers in base 60 (the way our clocks work today).

  3. Let’s analyze what’s happening. Simplest type problem: = 6 2 x 3

  4. = 20 4 x 5

  5. 10 lines 10 points + What about a problem like this? 13 x 4 = 52 The intersection of 13 lines 4 lines. 12 4

  6. Sample Problem: 12 x 234

  7. 100 12 x 234 (2 x 2) 100 10 (1 x 2) 1000 (2 x 3) 10 10 7 8 2 1 (1 x 3) 100 (2 x 4) 1 2808 (1 x 4) 10 1 10

  8. 100 10 1 1 10 100 a b c x d e f c 100 b 1000 10 a 10000 100 1 d 1000 10 e 100 f

  9. a b c d e f x a bc x def cf ad ae+bd af+be+cd bf+ce 100 10 1 10,000 1,000

  10. a b c d e f x + a bc x def cf ad ae+bd af+be+cd bf+ce 100 10 1 10,000 1,000 fa af fb bf fc cf ea ae eb be ec ce da ad db bd dc cd

  11. 10? 10? 10? 10? 10? 10? a.bc x de.f c b a d e f

  12. 101 100 10-1 10-2 10-1 100 a.bc x de.f c b a d e f

  13. Decimal Multiplication

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