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Activity
Emr: Exercises in Math Readiness Activity
University of Saskatchewan (Canada)

Emr: Exercises in Math Readiness

For Students K - 1st Standards
Practice your mental math skills with this site, where practice problems in addition, subtraction, multiplication, and division abound. Introductory, intermediate, and advanced levels are available. Just type in your answer and you'll...
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Unit Plan
Mangahigh: Number: Mental Addition and Subtraction of Large Numbers Unit Plan
Mangahigh

Mangahigh: Number: Mental Addition and Subtraction of Large Numbers

For Students 2nd - 6th Standards
This site provides students practice with the concept of mental addition. Students can learn about the topic by completing an interactive tutorial. Students can then take a ten question timed test to practice the skill.
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Activity
The Math Forum: K 12 Math Problems, Puzzles, Tips & Tricks Activity
National Council of Teachers of Mathematics

The Math Forum: K 12 Math Problems, Puzzles, Tips & Tricks

For Students K - 1st
At this site us these tips & tricks to help students become better mental mathematicians.
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