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Okta challenges you to a duel! Collect cards with a specified sum, and you win! But you better do it before Okta does! Choose how many cards (9 or 16), what types of numbers (whole numbers or decimals), and Okta’s level of strategy (easy to hard).
This app was developed for students of all ages by Illuminations. It is also available as an online activity along with many other free math resources for children at http://illuminations.nctm.org.