11_29_06

2:00 Whole-class story problem about how many more.

Small group
2:10 Estimating practice with a group of 23 objects.

Put out a group of 23 pennies in a pile (so students can't count them). Ask them to estimate how many there are and write them on a white board. "Let's find out how many groups of tens and how many extras there are." Use a penny strip to lay the pennies on it and see how many groups of ten there are. Stop after 10 and ask if anyone wants to change their estimate. Finish 2 groups of 10 and count the extras. "How many groups of 10 are there? How many extras? How many pennies are there?" "We write the number 23 like this: 2 because there are 2 groups of 10, and 3 because there are 3 extras." Check their estimates to see who was close.

2:20 Play Collect 15 as a whole group (pass dice around).

2:35 Play Snap It!

Large group
Story problems practice / share strategies.