acute angle - An angle that is open less than a right angle , equivalent fraction - Fractions that name the same region,part of a set, or a part of a segment, elapsed time - The amount of time between the beginning of an event and the end of the event, estimate - To give an approximate value rather than an exact answer., fraction - A symbol such as 2/3, 5/1, or 8/5, used to name a part of a whole, a part of a set or location on a number line., expanded form - A number written as the sum of the values of its digits. Ex: 2,476=2,000+400+70+6, identity property of addition - The sum of any number and zero is that number, hundredth - One part of 100 equal parts of a whole, greater than symbol (>) - A symbol that points away from a greater number or expression. Ex: 450> 449,

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