Unit 10 Contents

Use Mental Math

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1. Estimate the sums. Then solve the following problems using circle pieces, mental math, or paper and pencil. Record your work. Show that your answer is correct with circle pieces. Check for reasonableness.
1. 1 + =
2. 1 + 2 =
3. 
4. 


2. Explain how you know your answer for Question 1C is reasonable.