100 x 100 = 10000 2000 x 20 = 20000
1000 x 1000 = 1000000 300 x 4000 = 1200000
As you can see, when we multiply numbers like these we can wind up with a
lot of zeroes. Normally we would put commas in them like this:
10,000 20,000
1,000,000 1,200,000
The activities will not work with commas, though, and so you will have to be
extra careful when entering zeroes. The nice thing about the commas is that
it makes it easy to see the place value columns.