This is a modification of the Illustrative Math lesson, "Crossing the Decade Concentration" https://www.illustrativemathematics.org/content-standards/1/NBT/A/1/tasks/405. This lesson was used with a tier 3 fourth grade intervention math group to help students count forward and backward by ones; specifically focusing on crossing the decades. I modified this lesson by extending the counting sequence to 200 instead of 100 and placed cards in 4 by 4 arrays instead of 3 by 3. My students were quite proficient counting forward across decades, but were not with counting backward across decades, so I also modified the game to practice this. Students picked from the "_0" number cards first and had to verbalize the number one back, the "_9" number. It was very important that they verbalize that number to show that they were truly thinking about crossing the decades versus just "guessing" for the card match. My students also needed additional practice crossing decades with numbers in the 100s so I extended the cards to 200 to practice this.
- Subject:
- Mathematics
- Material Type:
- Learning Task
- Date Added:
- 04/21/2018