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### Course: Early math review > Unit 6

Lesson 1: Skip counting by 100s# Skip-counting by 100s

Sal counts by 100s.

## Want to join the conversation?

- if i can count by 5s, 10s, 100s and 1000s will i be able to count by 2000(9 votes)
- Yes you can count by any number! For example, you can count by 369s (hard, but you still could)! I hope this helps!(16 votes)

- Skip counting by 100s must be very easy because just like skip counting by 1s or 10s you need to memorize the 100s. It goes like 100, 200, 300, 400, 500, 600, 700, 800, 900, 1,000?(6 votes)
- So, is there usually a comma between the first number (in the thousands place) and the second number in a number (in the hundreds place) like 1,832?(3 votes)
- The "thousands separator" depends on which country and/or language: some countries use commas, some use spaces, and some use periods. (And for the decimal point, some countries use a comma instead of a period.) For example, for the number "1,234,567.89":

England:

1,234,567.89

France:

1 234 567,89

Spain:

1.234.567,89(3 votes)

- so i can count by 1000 right(2 votes)
- Yeah, you'd be able to count by any number, including 1000(1 vote)

- how do

I count by 100s(1 vote)- Skip-counting by 100s means we keep adding 100 to the starting number.

If the starting number is 387, the next number is 387 + 100 = 487 and the number after that is 487 + 100 = 587 and so on.

Theoretically, this adding of 100 could go on forever and we would end up with the infinite sequence

387, 487, 587, 687, 787, 887, 987, 1087, 1187, 1287, 1387, ...

With a different starting number we get a different sequence.

For example, if the starting number is 8, we get

8, 108, 208, 308, 408, 508, 608, 708, 808, 908, 1008, 1108, ...(2 votes)

- Can we write a zero in the hundred's place?

Is 043 also an acceptable way to write 43?(1 vote)- Yes, that is correct. You could put ten zeros in front of 43 and it would still equate to 43. It is an acceptable way, but is unnecessary and not commonly written as such.

Hope this helps!(2 votes)

- Don't you always have to start by 0 when you count by any number?(1 vote)
- No, you can start on any number. For some people it is easier to start at zero, but you can start on any number as long as you are still doing the task.(2 votes)

## Video transcript

- [Voiceover] When
counting by 100s from 43 to 1,043, which numbers will we say? Select all that apply. So let's do that. Let's start with 43 , and then let's just keep adding 100 to 43. So if we add 100 to 43,
we're going to get 143. Now let's keep adding 100 to it. If we add another 100, we're now going to have two hundreds and 43, or 243. Now let's keep adding 100 to it. So if we add another 100
we're going to have 343. I think you see what's going on here. You add 100 again,
you're going to have 443. I'm coloring in the 100s place so that we can keep track of that. You add another 100,
you're going to have 543. Then add another 100,
you're going to have 643. Add another 100, you're going to have 743. Let's keep adding 100, keep adding 100. Add another 100, you're going to have 843. Add another 100, you're going to have 943. Or you can do that as
nine hundreds and 43. Or nine hundreds and
four tens and three ones. And let's add another 100. So if you add another
100, you could view this as 10 hundreds and 43. But 10 hundreds is the
same thing as 1,000. So we would read this as 1,043. And that's what they
wanted us to count up to 1,043 is the same thing
as 10 hundreds and 43. So which of these numbers did we see when we counted from 43 to 1,043? Well we didn't see 44. We didn't see 123. But we did see 143, so we did see 143. We saw 543, we saw 543. And we saw 843. So we saw these numbers. Now you might have been able
to do this in your head. You might have said, "OK
43, then 143, then 243, 343, 443, 543, 643, 743,
843, then 943 and then 1,043. Either way, these are the numbers that we said when we
counted from 43 to 1,043. These are three of the
numbers that we said.