Term A · Chapter 2 · Lesson 2
Mental Addition — Part 2
Use compensation: make an addend easier and undo the adjustment.
MATH-3A-C02-L0235–45 minutes · flexible
Today's challenge
Find 198 + 140 using compensation. Try your own method, then compare it with a model.
What you'll learn
- Use compensation: make an addend easier and undo the adjustment.
- Explain the connection between a diagram and a number sentence.
- Solve a fresh application without step-by-step hints.
Before this lesson
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