Chapter 6: Subtraction
Subtracting two-digit numbers, taking away, number-line subtraction, mental subtraction, word problems.
Topic 6.1: Subtracting Two-Digit Numbers and Taking Away
📖 Read Lesson (15m)
Column subtraction and crossing out method.
Topic 6.2: Number-Line Subtraction, Mental Subtraction, and Word Problems
📖 Read Lesson (15m)
Counting back on number lines and story sums.