Understand the usefulness of approximations. 0506.4.11

Links verified on 1/4/2012

1. Anti-Homework - estimate angles from 0 to 180 - correct answers give you a homework grenade to get rid of assignments [gets progressively harder]
2. Approximation - ten multiple-choice questions
3. Approximation - rounding to the nearest whole number
4. Approximation Activity - Why not make an approximation? Have a try.
5. Approximation: Trial and improvement - When using trial and improvement guess what the answer might be, then improve on it until you get close to the correct answer.
6. Eratosthenes Estimates Earth - See how Eratosthenes estimated the circumference of the Earth 2000 years ago
7. Estimation - Learn to estimate addition, subtraction, multiplication and division by rounding numbers before performing the operation with this multimedia tutorial.
8. Estimation Practice - practice estimating addition, subtraction, multiplication and division by rounding numbers before performing the operation with this quiz
9. Making Estimates - introduction to making estimates while shopping [Uses UK monetary values]
10. Rounding - Learn about rounding numbers to a specific place value in a basketball court with this multimedia tutorial.
11. Rounding - Practice rounding numbers to a specific place value in a basketball court with this quiz.

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