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1² 1 2² 4 3² 9 4² 16 5² 25 6² 36 7² 49 8² 64 9² 81 10² 100 11² 121 12² 144 13² 169 14² 196 15² 225 16² 256 20² 400 25² 625 square root of 121 11 square root of 144 12 square root of 169 13 square root of 196 14 square root of 225 15 square root of 256 16 square root of 400 20 square root of 625 25 numerator the top number in a fraction denominator the bottom number in a fraction integer numbers along the number line, like -2, -1, 0, 1, 2. Includes whole number and their opposites. Does not include fractions or decimals. even integer integers that end in 0, 2, 4, 6, or 8 odd integer integers that are not divisible by 2. they are numbers that do not end in 0, 2, 4, 6 or 8 positive number a number that is greater than zero, like 1.5, 10, and 1/2 negative number a number that is less than zero, like -5, -1/2, -3.25 prime number integers that have only two factors, the number 1 and itself. the number 1 is not a __ number because it only has one factor. the number 2 is the only even __ number. real number all the numbers you can think of. includes integers, fractions, and decimals whole number counting numbers (numbers you can count on your fingers), like 1, 2, 3, and zero. Does not include negative numbers.