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7 Cards in this Set

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 Define Commutative Property. Give and example. Definition: The order of the addends does not change the sum. example: 3 + 4 = 4 + 3 Define associative property. Give an example. The way the addends are grouped does not change the sum. example: (12 + 8) + 48 = 68 or 12 + (8 + 48) = 68 Define Identity property. Give an example. The sum of any number and 0 equals the number. example: 5 + 0=5 and 0+5=5 Estimate the following by rounding. 645+252= 600 + 300 = 900 Rounded to the nearest whole number (hundreds) also: 650 + 250 = 900. This is more difficult. Estimate with Decimals. Estimate this number. Round to the nearest whole number. 34.38-12.831= Round to the nearest whole number. 34-13= 21 What is important to remember when adding or subtracting decimals? ex: 2.9 -1.71 _____ The decimal point must be lined up in the sum and write an equivalent decimal if necessary. ex: 2.90 -1.71 _____ 1.19 Define or give an example or an algebraic expression. a mathematical phrase made of numbers and variables. example: w + 15 = for w = 1