This is a modification of the Illustrative Math lesson, "Ford and Logan ...

This is a modification of the Illustrative Math lesson, "Ford and Logan add 45 + 36," https://www.illustrativemathematics.org/content-standards/tasks/2068. This lesson was used with a tier 3 fourth grade intervention math group to help students develop their understanding of place value and use of tens language when adding two digit numbers. I modified it to meet the students' needs by adding ways two other students (Sarah and Tammy) solved the problem: Sarah said, "I know 4 tens plus 3 tens is 7 tens; 5 ones plus 6 ones is eleven ones which is 1 ten and 1 one so 4 tens plus 3 tens plus 1 tens is 8 tens and the one left so the answer is 81." Tammy said, " 45 plus 30 is 75, plus 6 more is 81." Students analyzed and discussed all four methods and compared them to their own methods. I then had students practice using the tens and ones language (like Sarah) for some more addition problems without using place value blocks or models.

- Subject:
- Mathematics
- Material Type:
- Learning Task
- Author:
- MEGAN HINDE
- Date Added:
- 08/02/2019