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# Chapter 1 - Math

### Place Value, Adding, and Subtracting

Associative Property of Addition Addends can be regrouped and the sum remains the same. Example: (a+b)+c = a+(b+c)
Addends any number used to get the sum or the total.
Commutative Property of Addition The order of the addends can be changed and the sum remains the same. Example: a+b+c=b+c+a
Compatible numbers Numbers which are easy to compute with mentally.
Compensation Adjusting one number of an operations to make computations easier and balancing the adjustment by changing the other number
Digits The symbols used to show numbers: 0, 1, 2, 3, 4, 5, 6, 8, 8, and 9.
Expanded form A way to write a number that shows the palce value of each digit. Example: 3,000+500+60+2
Equivalent decimals Decimals which name the same amount. Example 0.7=0.70
Front-end estimation A method of estimating by changing numbers to the place value of their front digit and then finding the sum or difference.
Rounding A process that tells which multiple of 10, 100, 1,000, etc. a number is closest to.
Sum The number that is the result of adding two or more addends.
Standard form A number written with commas separating groups of three digits starting from the right. Example 3,456,789
Place value The position of a digit in a number that is used to determine the value of the digit. Example: In 5,318, 3 is in the hundreds place. So the 3 has a value of 300.
Period A group of 3 digits in a number. Periods are separated by a comma and start from the right of a number.
Tenth One out of ten equal parts of a whole.
Thousandths One out of thousand (1,000) equal parts of a whole.
Word form A number written in words using place value.
Hundredth One part of 100 equal parts of a whole.
Difference The number that results from subtracting one number from another.
Created by: Ms. Smiley