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# Number & Operations

### Vocabulary

TermDefinition
whole number the basic counting numbers 0, 1, 2, 3, 4, 5, 6, … and so on
rounding To replace a number with a number that tells about how much or how many to the nearest ten, hundred, thousand, and so on. Example: 42 rounded to the nearest 10 is 40.
estimation to find a number that is close to the exact answer.
regroup - (regrouping) to name a whole number in a different way. Example: 28 = 1 ten 18 ones
number line A line that shows numbers in order using a scale.
place value The value given to the place a digit has in a number. Example: In 946, the place value of the digit 9 is hundreds.
subtraction - to take away from a group or a number of things. When we subtract, the number of things in the group reduce or become less.
addition Finding the total, or sum, by combining two or more numbers.
plus A symbol that shows addition; combine; put together two or more quantities.
digit The symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 used to write numbers.
difference The answer when subtracting one number from another.
identity property of addition says that the sum of 0 and any number is that number. Here's an example: 0 + 4 = 4 0 + 4 = 4 0+4=4.
commutative property of addition says that changing the order of addends does not change the sum.
associative property of addition Changing the grouping of addends does not change the sum. For example, (2 + 3) + 4 = 2 + (3 + 4)(2+3)+4=2+(3+4)left parenthesis, 2, plus, 3, right parenthesis, plus, 4, equals, 2, plus, left parenthesis, 3, plus, 4, right parenthesis.
bar graph A graph drawn using rectangular bars to show how large each value is.
line plot a graph that displays data as points or check marks above a number line, showing the frequency of each value.
Created by: ygenien

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