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**Grade 4 – Developing Mental Math Skills**

- Describe and use strategies to:
- add and subtract two-digit numbers
- multiply to 10 × 10
- divide to 100 ÷ 10
- multiply whole numbers by 10, 100,
- and 1000, and divide by 10 and 100
- round four-digit numbers to the nearest ten, hundred, and thousand
- estimate addition, subtraction, and multiplication of whole numbers

– Focusing on the Fundamentals of Math – A Teacher’s Guide, p.6

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