Engage

Step 1 - Display a hundreds chart for students to observe. Ask students to review the hundreds chart silently for a minute and then share, with a friend beside them, the patterns they noticed.

Step 2 - After some students share their findings whole group, guide students to essential generalizations from any number. For example, when we go up one unit we subtract ten or when we go down one unit we add ten. Also, we can add or subtract one if we move to the left or right from any number.

Explore/Explain

Step 3 - In a whole group setting, ask students "what number would I land on if":

- I moved one unit above 27?
- Below 19?
- Above 76?
- Below 46?"

After the children demonstrate a high level of accuracy, pose the question, "Would it be okay if I simply stated what's 10 less than 27?" Continue, by asking what is:

- Ten plus 19
- Ten less than 76
- Ten more than 46

Step 4 - Allow students to use dry erase boards or student response systems to answer the following plus ten or minus ten type problems from any number:

- Ten less than 49
- Ten more than 87
- Ten plus 36
- 28 minus 10
- 74 plus ten
- Ten less than 63

Step 5: Divide the students up into cooperative learning groups of 2 and allow them to play the 10 More or 10 Less game.

Step 6: Allow each student to practice adding plus or minus ten, as well as, plus or minus one on the hundreds chart from the website IXL Hundreds Chart Practice.