Why two different Results in Matrix Multiplication

[SFares]

Hello,

Attached is Mathcad 15 file. I don't know why i am getting two different results with matrix multiplication.

Thanks,

Sam

[StuartBruff · Accepted solution]

Because the displayed values of your calculations of k' and deltaM75 are only accurate to 3 or 4 decimal places.   Try displaying the results to 7 decimal places and multiplying, and you should get agreement (1.3922).

Stuart

[SFares]

I never thought that the number of decimals make such a difference. Thank you so much Stuart!

Regards,

Sam

[StuartBruff]

No worries, Sam, it had me puzzled for a bit until the word "round-off" popped into my skull.

Stuart