Grade 2 Math: Grade 2 Module 4, Lesson 24: Use manipulatives to represent subtraction with decompsitions of 1 hundred as 10 tens and 1 ten as 10 ones.

Grade 2 Math: Grade 2 Module 4, Lesson 9: Use math drawings to represent the composition when adding a 2-digit to a 3-digit addend. WCNY TV Classroom is available to stream on pbs.org and the free PBS ...