Wednesday, September 19, 2007

Personal Banking

Yesterday, we started multiplying two- digit numbers with had same first digit numbers, Second digit sum to 10.

We’ll use 83 x 87 = 7221 as an example.

Procedure Example

Step 1: Multiply first digit by one number greater than itself;

this is the first part of the answer. 8 x 9= 72

Step 2: Multiply the two second digits;

the product is the last part of the answer. 3 x 7 = 21

Step 3: Put the pieces together. 83 x 87 = 7221

We also began to reconcile the statement of account to transaction record. The statement of account was correct and the transaction record had some errors. Confer the statement of account and the transaction record, then find the errors and correct it.

The next scribe will be...............jay


Lani said...

Hi Melchor,

Thanks for teaching me this great strategy. I was not aware of it.

Can you help me? I'm a bit confused. In step 3 you said put the pieces together, right? I see how the 72 came from step one. Where did you get the 21 from? What do I do with the 14 from step 2?

Thanks for helping me with this!

melchor said...

Sorry! There is an error on the first one, I publish...I made a mistake on step 2, I think, but changed it, now it's all right....sorry again!!:)