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NES Elementary Education Subtest 2 | questions and answers | Latest 2024/25
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NES Elementary Education Subtest 2 | questions and answers | Latest 2024/25
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NES Elementary Education Subtest 2 | questions and an swers | Latest 2024/25 Natural Numbers N = {1, 2, 3, 4, 5, 6, . . . } Whole natural numbers together with zero. W = {0, 1, 2, 3, 4, 5, 6, . . . } Every whole number has a unique opposite or negative whose sum with it is 0. For example, 2 + ( -2) = 0 The set of integers consists of the whole numbers and their opposites. Z = {. . ., -3, -2, -1, 0, 1, 2, 3, . . . } Every no nzero integer has a unique reciprocal whose product with it is one. For example, 2 × 1/2 = 1 The ratio or fraction of one integer to a nonzero integer is the product of the first integer with the reciprocal of the second. For example, the ratio of 2 to 3 is 2/3 = 2 × 1/3 not every rational number is an integer. For example, 1/2 is a rational numb er that is not an integer. 1/2 = 0.5 There are three basic properties of addition: commutativity, associativity and identity. Commutative property. When adding two numbers, the sum is the same regardless of the order in which the numbers are added. 2 + 3 = 3 + 2 Associative property. When adding three or more numbers, the sum is the same regardless of the way in which the numbers are grouped. 2 + (3 + 5) = (2 + 3) + 5 Identity property. Adding zero to a number does not change it. 2 + 0 = 2 There are three basic properties of multiplication: commutativity, associativity and identity. Distributive property. The product of a number with a sum equals the sum of the products of the number with each term of the sum. 2 × (3 + 5) = (2 × 3) + (2 × 5) Expone ntiation Exponentiation is repeated multiplication. An exponent is often called a power. For example, the third power of 2 is 2³ = 2 × 2 × 2 = 8 We define the zero power of any nonzero number to be 1. For example, (-3)0 = 1 A negative exponent indicates a reciprocal. For example, 2 (-3rd power) = (3rd power) = 1 / 8 The first power of any number is itself. For example, 2 (to the 1st power) = 2 To multiply like bases with exponents, add the exponents. For example, 2 (to the 3rd) x 2 (to the 5th) = 2 (to the eighth) To exponentiate a power, multiply the exponents. For example, (2 to the 3rd) to the 5th = 2 to the 15th 10 to the 0 power 1 10 to the 1 power 10 10 to the -2 power to the 2 power or 10 to the 2 power x 10 to the 3 power 10 to the 5 power Identifying Place Value in Numbers 2045 2045 = (2 x 10 to the 3 power) + (0 x 10 to the 2 power) + (4 x 10 to the 1 power) + 5 x 10 to the 0 power) Digits to the right of a decimal point correspond to negative powers of ten. For example, 23.405 23.405 = (2 x 10 to the 1 power) + (3 x 10 to the 0 power) + (4 x 10 to the -1 power) + (0 x 10 to the -2 power) + (5 x 10 to the -3 power) Converting a fraction to a decimal. For example 3/8 3 divided by 8 = 0.375 convert 0.45 to a fraction. 45/100 convert 3.208 to a mixed number. 3 + 208/1000 Converting a fraction to a percentage. Convert the fraction to a decimal and then convert the decimal to a percentage. For example, 2/5 2/5 = .4 = 40% Converting a percentage to a fraction. Convert the percentage to fraction with a denominator of 100. For example,The benefits of buying summaries with Stuvia:
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