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# 6A Unit 1

### Unit 1 Vocabulary

TermDefinitionExample
Standard Form A number written using digits and place value is in _________. 2,174
The "Associative Laws" say: * It doesn't matter how you group the numbers when you add. * It doesn't matter how you group the numbers when you multiply. (In other words it doesn't matter which you calculate first.) Example addition: (6 + 3) + 4 = 6 + (3 + 4) Because 9 + 4 = 6 + 7 = 13 Example multiplication: (2 × 4) × 3 = 2 × (4 × 3) 8 × 3 = 2 × 12 = 24
Compatible numbers are numbers that are easy to compute mentally. They are particularly useful for estimating products and quotients. Estimate 151 ÷ 146 151 ≈ 150, 14.6 ≈ 15 150 ÷ 15 = 10 151 ÷ 14.6 ≈ 10
Expanded Form is a sum that shows the place and value of each digit of a number. 0.75 = 0.7 + 0.05
Expression is a mathematical phrase that contains numbers and operation symbols. 18+11×6
Front-end estimation First adding the "front-end" digits. Then you estimate the sum of the remaining digits. You adjust the sum of the front-end digits if necessary. Estimate \$3.09 + \$2.99 \$3.09  \$ .09 +\$2.99  \$ .99 \$5 about \$1 So \$3.09 + \$2.99 ≈ 5 + 1, or \$6
Order of operations Parenthesis Exponents Multiplication Division Addition Subtraction 23(7-4) = 23  3 = 8  3 = = 24
Commutative Property of Addition Changing the order of the addends does not change the sum. 9+5 = 5+9
Identity Property of Addition The sum of 0 and any number is that number. 0+9=9
Created by: OCA McBrown