Math Riddles

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At a children’s party, 10 kids had juice, 8 kids had cake, and 6 kids had juice and cake. How many kids were there at the party?
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Three point one four, one five nine two six five, three five eight nine… What am I?
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Robert and David played several golf matches against each other in a week. They played for a pizza at each match, but no pizzas were purchased until the end of the week. If at any time Robert and David had the same number of wins, those pizzas were canceled. Robert won four matches (but no pizzas), and David won three pizzas. How many rounds of golf were played?
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I am a three-digit number. All of my digits are prime. One of the numbers is even. Each of my numbers are used only once. The total of my first and last digits equals 10. The total of my first two digits equals 5.
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What happened to the plant in the math classroom?
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What is the most useful instrument in a mathematics teacher’s tool kit?
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