One digit at a time, I shall try and determine the digit you've left out.

So you should have as an answer either a six digit or probably a seven digit number.

Four Digit

Two Digit

Good, OK, that's one.

Seven? Seven?

Two Digit Apostrophe

Is there any possible way that I could know what seven digit numbers you have?

So our final answer can only the 3 significant figures.

We'll end up getting 28, 18, and 21.

So let's do seven hundred let me switch colors.

Let's not mess around.

Just give some indication if it's right.

18 of them lined up in an auditorium.

Again, we have a constructor, which takes the zip code which is a string consisting out of five digits.

Well do some three digit numbers.

20 digits or less, sit down.

Call out a single digit that will be the five digit number that I will try to square, go ahead.

AB Yes?

Another three digit (Applause)

Based on the examples in the last video

18. So it goes to this lady here.

Only if the answer to one of these has more than one digit in it.

Nothing to carry.

If each of you would call out a single digit between zero and nine, that will be the four digit number that I'll square.

So I can only have 3 significant figures in my product.

By contrast, your place of birth is more likely to include letters rather than numbers.

These 4 values take the names N11, N10, N01, and N00, respectively.

(And we'll talk more about digits in a future video.)

For example, over here they regular that your birth date be specified as two digits, two more digits, and four more digits corresponding the month, the day, or the year.

So we're gonna investigate that in more detail on this next slide.

This format is not perfect yet.

But, before we begin, we're going to try another little magic trick.

1. is okay or 3.14159.

We have the heap structure.

If you just add these two numbers up, and let's say these are measurements, so when you make it (these are clearly 3 significant digits) we're able to measure to the nearest hundreth.

Well, this is pretty straightforward. seven times two is fourteen.

I count all of the digits, all of the leading 0's behind the decimal, including the leading non zero numeral.

I have 4 significant figures over here, I have 2 significant figures here,

Now, what's the landmark position?

So let's look for a two digit number in the string July 28, 1921.

The star will refer back to the space, and we can have 0 or more of these.

So the first thing that is pretty obvious is that any non zero digit, and any of the zero digits in between are significant.

The reason why this assertion failed is simply a rounding error, the numbers are the same up to the 11th digit.

It's all sorts of things.