Take a look at the examples below to see how you can use number lines to estimate, work out and write numbers. Next, count the number of intervals. There are 10 in total. How many 10s go into 50?

Now look at the numbers highlighted on the grid ... We say the ones first, then tens. However, when you write the number in numerals, the tens come before the ones.

Knowing how to write numbers in words on a check is even more ... that would make $450 look like “Four hundred fifty and ...