1, 10, 100 more/less - September 2019

We have been learning how to find one, ten and one hundred more or less than a given number. We've been having lots of practice with base 10 equipment so that we can see clearly what happens when we do this. Using the base 10 has been particularly useful when we have faced calculations which involve bridging over ten and 100 (e.g. 1 more than 639 or 10 more than 192).