Will one be left out? Students will practice creative problem solving as they strive to answer this question and determine whether a group is even or odd.

Show your students how long one minute is. Use a story and activities to help them gain a better understanding of time.

Many students cringe when they see a subtraction problem with multiple zeros. The “Subtract One” strategy in this lesson involves reducing the top number by one to turn the 0 digits into 9’s and then adding the one back in at the end.