This math topic focuses on practicing the calculation of circle circumferences given their radii. It reinforces understanding of the formula circumference = 2πr, emphasizing mental math skills by advising learners not to use calculators and to approximate π slightly over 3. The topic includes various multi-choice questions where students are required to choose the correct circumference from a set of options. This exercise also fits into a broader introductory unit on the geometry of circle circumferences, suitable for learners aiming to solidify their grasp of basic circle properties.
Work on practice problems directly here, or download the printable pdf worksheet to practice offline.
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Find the circumference without using a calculator. Remember that π is just a bit more than 3.