This interactive SMARTboard lesson is a complete lesson in rounding numbers to the nearest ten and to the nearest hundred. It can be broken into several mini lessons followed by practice in each of the skills. It begins with a definition of what it means to round numbers. Diagrams of number lines help explain the steps in rounding numbers to the nearest ten and hundred. If you are looking for more practice in this skill, check out the Rounding Numbers Game & Activity which is a separate activity in my store. Learn how to round numbers in this lesson and then play the game. Created with Smart Notebook 11.